**85,934 results** match your criteria *Physical review letters[Journal] *

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Phys Rev Lett 2019 Mar;122(12):121802

Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

The axion is a promising dark matter candidate, which was originally proposed to solve the strong-CP problem in particle physics. To date, the available parameter space for axion and axionlike particle dark matter is relatively unexplored, particularly at masses m_{a}≲1 μeV. ABRACADABRA is a new experimental program to search for axion dark matter over a broad range of masses, 10^{-12}≲m_{a}≲10^{-6} eV. Read More

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Phys Rev Lett 2019 Mar;122(12):126801

Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel.

Majorana bound states are zero-energy modes localized at the ends of a one-dimensional (1D) topological superconductor. Introducing disorder usually increases the Majorana localization length, until eventually inducing a topological phase transition to a trivial phase. In this Letter, we show that in some cases weak disorder causes the Majorana localization length to decrease, making the topological phase more robust. Read More

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Phys Rev Lett 2019 Mar;122(12):128301

Institut de Physique Théorique Philippe Meyer, École Normale Supérieure, PSL University, Sorbonne Universités, CNRS, 75005 Paris, France.

Many complex generative systems use languages to create structured objects. We consider a model of random languages, defined by weighted context-free grammars. As the distribution of grammar weights broadens, a transition is found from a random phase, in which sentences are indistinguishable from noise, to an organized phase in which nontrivial information is carried. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.128301 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):127701

Rudolf Peierls Centre for Theoretical Physics, Parks Road, Oxford OX1 3PU, United Kingdom.

We discuss a theoretical model of an on-demand single-particle emitter that employs a quantum dot, attached to an integer or fractional quantum Hall edge state. Via an exact mapping of the model onto the spin-boson problem we show that Coulomb interactions between the dot and the chiral quantum Hall edge state, unavoidable in this setting, lead to a destruction of precise charge quantization in the emitted wave packet. Our findings cast doubt on the viability of this setup as a single-particle source of quantized charge pulses. Read More

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https://link.aps.org/doi/10.1103/PhysRevLett.122.127701 | Publisher Site |

http://dx.doi.org/10.1103/PhysRevLett.122.127701 | DOI Listing |

Phys Rev Lett 2019 Mar;122(12):120503

Departamento de Matemáticas, Universidad Carlos III de Madrid, E-28911 Leganés (Madrid), Spain.

Entanglement theory is formulated as a quantum resource theory in which the free operations are local operations and classical communication (LOCC). This defines a partial order among bipartite pure states that makes it possible to identify a maximally entangled state, which turns out to be the most relevant state in applications. However, the situation changes drastically in the multipartite regime. Read More

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Phys Rev Lett 2019 Mar;122(12):128101

Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom.

The more we learn about the cytoplasm of cells, the more we realize that the cytoplasm is not uniform but instead is highly inhomogeneous. In any inhomogeneous solution, there are concentration gradients, and particles move either up or down these gradients due to a mechanism called diffusiophoresis. I estimate that inside metabolically active cells, the dynamics of particles can be strongly accelerated by diffusiophoresis, provided that they are at least tens of nanometers across. Read More

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https://link.aps.org/doi/10.1103/PhysRevLett.122.128101 | Publisher Site |

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Phys Rev Lett 2019 Mar;122(12):128006

Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

The discontinuous jump in the bulk modulus B at the jamming transition is a consequence of the formation of a critical contact network of spheres that resists compression. We introduce lattice models with underlying undercoordinated compression-resistant spring lattices to which next-nearest-neighbor springs can be added. In these models, the jamming transition emerges as a kind of multicritical point terminating a line of rigidity-percolation transitions. Read More

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https://link.aps.org/doi/10.1103/PhysRevLett.122.128006 | Publisher Site |

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Phys Rev Lett 2019 Mar;122(12):127001

Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot, Sorbonne Paris Cité, UMR No. 7162, CNRS, 75013 Paris, France.

The pressure evolution of the Raman active electronic excitations of the transition metal dichalcogenides 2H-TaS_{2} is followed through the pressure phase diagram embedding incommensurate charge-density-wave and superconducting states. At high pressure, the charge-density wave is found to collapse at 8.5 GPa. Read More

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https://link.aps.org/doi/10.1103/PhysRevLett.122.127001 | Publisher Site |

http://dx.doi.org/10.1103/PhysRevLett.122.127001 | DOI Listing |

Phys Rev Lett 2019 Mar;122(12):128003

Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.

We report on spontaneous rotational symmetry breaking in a minimal model of complex macromolecules with branches and cycles. The transition takes place as the strength of the self-repulsion is increased. At the transition point, the density distribution transforms from isotropic to anisotropic. Read More

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Phys Rev Lett 2019 Mar;122(12):120501

Institut National de la Recherche Scientifique-Centre Énergie, Matériaux et Télécommunications (INRS-EMT), 1650 Boulevard Lione-Boulet, Varennes, Québec J3X 1S2, Canada.

Entanglement witnesses are operators that are crucial for confirming the generation of specific quantum systems, such as multipartite and high-dimensional states. For this reason, many witnesses have been theoretically derived which commonly focus on establishing tight bounds and exhibit mathematical compactness as well as symmetry properties similar to that of the quantum state. However, for increasingly complex quantum systems, established witnesses have lacked experimental achievability, as it has become progressively more challenging to design the corresponding experiments. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.120501 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):121603

Institut für Theoretische Physik, Eidgenössische Technische Hochschule Zürich, Wolfgang-Pauli-Strasse 27, 8093 Zürich, Switzerland.

We compute the symbol of the two-loop five-point scattering amplitude in N=4 supersymmetric Yang-Mills theory, including its full color dependence. This requires constructing the symbol of all two-loop five-point nonplanar massless master integrals, for which we give explicit results. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.121603 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):126102

Department of Mechanical and Aerospace Engineering, University of California, Irvine, California 92697, USA.

The unique three-phase coexistence of metastable B2-FeNi with stable L1_{0}-FeNi and L1_{2}-FeNi_{3} is discovered near edge dislocations in body-centered cubic Fe-Ni alloys using atomistic simulations. Stable nanoscale precipitate arrays, formed along the compression side of dislocation lines and defined as linear complexions, were observed for a wide range of compositions and temperatures. By analyzing the thermodynamics associated with these phase transitions, we are able to explain the metastable phase formation and coexistence, in the process defining new research avenues for theoretical and experimental investigations. Read More

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https://link.aps.org/doi/10.1103/PhysRevLett.122.126102 | Publisher Site |

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Phys Rev Lett 2019 Mar;122(12):124504

Institut de Mécanique des Fluides de Toulouse (IMFT), Université de Toulouse, CNRS, Toulouse 31400, France.

To generate or maintain a turbulent flow, one needs to introduce kinetic energy. This energy injection necessarily fluctuates and these power fluctuations act on all turbulent excited length scales. If the power is injected using forces proportional to the velocity, such as those common in shear flows, or with a force acting at the largest scales only, the spectrum of these fluctuations is shown to have a universal inertial range, proportional to the energy spectrum. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.124504 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):128007

Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA.

We examine the static dielectric constant of electrolyte solutions with a polar and/or polarizable small-molecule solvent using a classical field-theoretic approach. We compute corrections to the dielectric constant and screening length due to intra- and intermolecular correlations via a renormalized one-loop approximation, accounting for the excluded volume of both solvent and electrolyte. In the salt-free case, we verify the one-loop theory by comparison with full numerical solutions of the field theory. Read More

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https://link.aps.org/doi/10.1103/PhysRevLett.122.128007 | Publisher Site |

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Phys Rev Lett 2019 Mar;122(12):129901

This corrects the article DOI: 10.1103/PhysRevLett.121. Read More

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Phys Rev Lett 2019 Mar;122(12):126802

Institute for Theoretical Physics, ETH Zurich, 8093 Zurich, Switzerland.

Tunneling spectroscopy of one-dimensional interacting wires can be profoundly sensitive to the boundary conditions of the wire. Here, we analyze the tunneling spectroscopy of a wire coupled to capacitive metallic leads. Strikingly, with increasing many-body interactions in the wire, the impact of the boundary noise becomes more prominent. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.126802 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):127206

Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.

We explore mechanisms of orbital-order decay in the doped Mott insulators R_{1-x}(Sr,Ca)_{x}VO_{3} (R=Pr,Y,La) caused by charged (Sr,Ca) defects. Our unrestricted Hartree-Fock analysis focuses on the combined effect of random charged impurities and associated doped holes up to x=0.5. Read More

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Phys Rev Lett 2019 Mar;122(12):124301

Daniel Guggenheim School of Aerospace Engineering Georgia Institute of Technology, Atlanta, Georgia 30332, USA.

Elastic waveguides with time-modulated stiffness feature a frequency-periodic dispersion spectrum, where branches merge at multiple integers of half the modulation frequency and over a finite wave number range. In this range, frequency becomes complex, with its real part remaining constant. The vanishing group velocity associated with these flat bands leads to frequency-selective reflection at an interface between a nonmodulated medium and a time-modulated one, which converts a broadband input into a narrow-band output centered at the half modulation frequency. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.124301 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):127204

European Synchrotron Radiation Facility, B.P. 220, 38043 Grenoble, France.

X-ray magnetic circular dichroism (XMCD) studies at the Er L_{2,3} edges of Er_{3}Fe_{5}O_{12} exhibit a change of the spectral shape as a function of temperature and magnetic field. Using singular value decomposition, this variation is understood as a linear combination of two components. The dominating component is associated with the Er magnetization, while the second contribution is identified as an induced signal from the Fe sites. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.127204 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):124302

School of Electrical Engineering, Iby and Aladar Fleischman Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel.

We theoretically study and successfully observe the evolution of Gaussian and Airy surface gravity water wave packets propagating in an effective linear potential. This potential results from a homogeneous and time-dependent flow created by a computer-controlled water pump. For both wave packets we measure the amplitudes and the cubic phases appearing due to the linear potential. Read More

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Phys Rev Lett 2019 Mar;122(12):124502

Laboratory for Aero and Hydrodynamics, Delft University of Technology, 2628CD Delft, Netherlands.

Stokes equations are commonly used to model the hydrodynamic flow around cilia on the micron scale. The validity of the zero Reynolds number approximation is investigated experimentally with a flow velocimetry approach based on optical tweezers, which allows the measurement of periodic flows with high spatial and temporal resolution. We find that beating cilia generate a flow, which fundamentally differs from the stokeslet field predicted by Stokes equations. Read More

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Phys Rev Lett 2019 Mar;122(12):123901

Department of Physics, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, and Jiujiang Research Institute, Xiamen University, Xiamen 361005, China.

We report a new scheme of ghost imaging by using a spatially structured pump in the Fourier domain of spontaneous parametric down-conversion for quantum-correlation-based pattern recognition. We exploit the mathematical feature of Laguerre-Gaussian mode's Fourier transform to describe the pump-modulated formation of a ghost image. Of particular interest is the experimental demonstration of a quantum equivalence of a Vander Lugt filter, based on which the nonlocal spiral phase contrast for vortex mapping and quantum-correlation-based human face recognition are implemented successfully. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.123901 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):121301

Department of Physics, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA.

Massive fields in the primordial Universe function as standard clocks and imprint clock signals in the density perturbations that directly record the scale factor of the primordial Universe as a function of time, a(t). A measurement of such signals would identify the specific scenario of the primordial Universe in a model-independent fashion. In this Letter, we introduce a new mechanism through which quantum fluctuations of massive fields function as standard clocks. Read More

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https://link.aps.org/doi/10.1103/PhysRevLett.122.121301 | Publisher Site |

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Phys Rev Lett 2019 Mar;122(12):123607

Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.

In quantum communication and photonic quantum information processing, the requirement of quantum repeaters and quantum memory often imposes a strict bandwidth prerequisite for the entangled photons. At the same time, there is ever more increasing demand for entangling more degrees of freedom, i.e. Read More

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Phys Rev Lett 2019 Mar;122(12):126103

Institute of Scientific Computing, Technische Universität Dresden, 01062 Dresden, Germany.

The ability to use external magnetic fields to influence the microstructure in polycrystalline materials has potential applications in microstructural engineering. To explore this potential and to understand the complex interactions between electromagnetic fields and solid-state matter transport we consider a phase-field-crystal model. Together with efficient and scalable numerical algorithms this allows the examination of the role that external magnetic fields play on the evolution of defect structures and grain boundaries, on diffusive timescales. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.126103 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):123401

Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970, São Carlos, São Paulo, Brazil.

We have developed an approach to continuously load ultracold ^{85}Rb_{2} vibrational ground-state molecules into a crossed optical dipole trap from a magneto-optical trap. The technique relies on a single high-power light beam with a broad spectrum superimposed onto a narrow peak at an energy of about 9400 cm^{-1}. This single laser source performs all the required steps: the short-range photoassociation creating ground-state molecules after radiative emission, the cooling of the molecular vibrational population down to the lowest vibrational level v_{X}=0, and the optical trapping of these molecules. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.123401 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):127203

Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.

We investigate the Gilbert damping parameter α for rare earth (RE)-transition metal (TM) ferrimagnets over a wide temperature range. Extracted from the field-driven magnetic domain-wall mobility, α was as low as the order of 10^{-3} and was almost constant across the angular momentum compensation temperature T_{A}, starkly contrasting previous predictions that α should diverge at T_{A} due to a vanishing total angular momentum. Thus, magnetic damping of RE-TM ferrimagnets is not related to the total angular momentum but is dominated by electron scattering at the Fermi level where the TM has a dominant damping role. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.127203 | DOI Listing |

Phys Rev Lett 2019 Mar;122(12):120504

Shanghai Branch, Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Shanghai 201315, China.

Finding exponential separation between quantum and classical information tasks is like striking gold in quantum information research. Such an advantage is believed to hold for quantum computing but is proven for quantum communication complexity. Recently, a novel quantum resource called the quantum switch-which creates a coherent superposition of the causal order of events, known as quantum causality-has been harnessed theoretically in a new protocol providing provable exponential separation. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.120504 | DOI Listing |

Phys Rev Lett 2019 Mar;122(12):128002

Theoretische Physik I, Universität Bayreuth, 95440 Bayreuth, Germany.

Microflows constitute an important instrument to control particle dynamics. A prominent example is the sorting of biological cells, which relies on the ability of deformable cells to move transversely to flow lines. A classic result is that soft microparticles migrate in flows through straight microchannels to an attractor at their center. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.128002 | DOI Listing |

Phys Rev Lett 2019 Mar;122(12):127205

Institute of Physics, Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic.

We report on x-ray magnetic circular dichroism experiments in pulsed fields up to 30 T to follow the rotations of individual magnetic moments through the field-induced phase transition in the ferrimagnet HoFe_{5}Al_{7}. Near the ground state, we observe simultaneous stepwise rotations of the Ho and Fe moments and explain them using a two-sublattice model for an anisotropic ferrimagnet with weak intersublattice exchange interactions. Near the compensation point, we find two phase transitions. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.127205 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):126403

Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.

The symmetry of a surface or interface plays an important role in determining the spin splitting and texture of a two-dimensional band. Spin-polarized bands of a triangular lattice atomic layer (TLAL) consisting of Sn on a SiC(0001) substrate is investigated by spin- and angle-resolved photoelectron spectroscopy. Surprisingly, both Zeeman- and Rashba-type spin-split bands, without and with spin degeneracy, respectively, coexist at a K point of the Sn TLAL. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.126403 | DOI Listing |

Phys Rev Lett 2019 Mar;122(12):128004

The University of Akron, Akron, Ohio 44325, USA.

The friction between a liquid swollen soft elastomer and a solid surface depends on the state of a confined liquid. To measure the physical state of the confined liquid, an interface-sensitive sum frequency generation spectroscopy technique was used to probe the contact region. We find that during sliding (friction) and pull-off (adhesion) experiments of pentadecane-swollen poly(dimethyl siloxane) lenses submerged in linear alkane (pentadecane) on a sapphire substrate, crystallinelike ordering of the liquid occurs only at the contact line, where we anticipate the highest shear. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.128004 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):121801

Institute of High Energy Physics, Beijing 100049, People's Republic of China.

Using e^{+}e^{-} annihilation data corresponding to an integrated luminosity of 3.19 fb^{-1} collected at a center-of-mass energy of 4.178 GeV with the BESIII detector, we measure the absolute branching fractions B_{D_{s}^{+}→ηe^{+}ν_{e}}=(2. Read More

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Phys Rev Lett 2019 Mar;122(12):127601

Institute for Solid State Physics, TU Wien, 1040 Vienna, Austria.

We present a dynamical mean-field study of dynamical susceptibilities in the two-band Hubbard model. Varying the model parameters we analyze the two-particle excitations in the normal as well as in the ordered phase, an excitonic condensate. The two-particle dynamical mean-field theory spectra in the ordered phase reveal the gapless Goldstone modes arising from spontaneous breaking of continuous symmetries. Read More

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Phys Rev Lett 2019 Mar;122(12):122301

Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, D-69120 Heidelberg, Germany.

Prescaling is a far-from-equilibrium phenomenon which describes the rapid establishment of a universal scaling form of distributions much before the universal values of their scaling exponents are realized. We consider the example of the spatiotemporal evolution of the quark-gluon plasma explored in heavy-ion collisions at sufficiently high energies. Solving QCD kinetic theory with elastic and inelastic processes, we demonstrate that the gluon and quark distributions very quickly adapt a self-similar scaling form, which is independent of initial condition details and system parameters. Read More

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Phys Rev Lett 2019 Mar;122(12):129902

This corrects the article DOI: 10.1103/PhysRevLett.116. Read More

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March 2019

Phys Rev Lett 2019 Mar;122(12):127401

Department of Applied Physics, Stanford University, Stanford, California 94305, USA.

The control of the valley degree of freedom lies at the core of interest in monolayer transition metal dichalcogenides, where specific valley-spin excitation can be created using circularly polarized light. Measurement and manipulation of the valley index has also been achieved, but mainly with purely optical methods. Here, in monolayer MoS_{2}, we identify a response to the valley polarization of excitons in the longitudinal electrical transport when the valley degeneracy is broken by an out-of-plane magnetic field B_{z}. Read More

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Phys Rev Lett 2019 Mar;122(12):123201

ITMO University, St. Petersburg 197101, Russia.

We consider two-dimensional spin-orbit-coupled atomic Bose-Einstein condensate in a radially periodic potential. The system supports different types of stable self-sustained states including radially symmetric vorticity-carrying modes with different topological charges in two spinor components that may have multiring profiles and at the same time remain remarkably stable for repulsive interactions. Solitons of the second type show persistent rotation with constant angular frequency. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.123201 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):127201

Institut für Theoretische Festkörperphysik, JARA-FIT and JARA-HPC, RWTH Aachen University, 52056 Aachen, Germany.

Polarized inelastic neutron scattering experiments recently identified the amplitude (Higgs) mode in C_{9}H_{18}N_{2}CuBr_{4}, a two-dimensional near-quantum-critical spin-1/2 two-leg ladder compound, which exhibits a weak easy-axis exchange anisotropy. Here, we theoretically examine the dynamic spin structure factor of such planar coupled spin-ladder systems using large-scale quantum Monte Carlo simulations. This allows us to provide a quantitative account of the experimental neutron scattering data within a consistent quantum spin model. Read More

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https://link.aps.org/doi/10.1103/PhysRevLett.122.127201 | Publisher Site |

http://dx.doi.org/10.1103/PhysRevLett.122.127201 | DOI Listing |

Phys Rev Lett 2019 Mar;122(12):125701

Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.

A multifaceted first-principles approach utilizing density functional theory, evolutionary algorithms, and lattice dynamics was used to construct the phase diagram of silicon up to 4 TPa and 26 000 K. These calculations predicted that (i) an anomalous sequence of face-centered cubic to body-centered cubic to simple cubic crystalline phase transitions occur at pressures of 2.87 and 3. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.125701 | DOI Listing |

Phys Rev Lett 2019 Mar;122(12):120402

Laboratoire Pierre Aigrain, École Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Université, Université Paris Diderot-Sorbonne Paris Cité, Paris 75005, France.

The controlled generation and the protection of entanglement is key to quantum simulation and quantum computation. At the single-mode level, protocols based on photonic cat states hold strong promise as they present unprecedentedly long-lived coherence and may be combined with powerful error correction schemes. Here, we demonstrate that robust ensembles of "many-body photonic cat states" can be generated in a Bose-Hubbard model with pair hopping via a spontaneous U(1) symmetry-breaking mechanism. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.120402 | DOI Listing |

Phys Rev Lett 2019 Mar;122(12):127202

Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA.

We address the nature of spin transport in the integrable XXZ spin chain, focusing on the isotropic Heisenberg limit. We calculate the diffusion constant using a kinetic picture based on generalized hydrodynamics combined with Gaussian fluctuations: we find that it diverges, and show that a self-consistent treatment of this divergence gives superdiffusion, with an effective time-dependent diffusion constant that scales as D(t)∼t^{1/3}. This exponent had previously been observed in large-scale numerical simulations, but had not been theoretically explained. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.127202 | DOI Listing |

March 2019

Phys Rev Lett 2019 Mar;122(12):123603

The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.

A mathematical extension of the weak value formalism to the simultaneous measurement of multiple parameters is presented in the context of an optical focused vector beam scatterometry experiment. In this example, preselection and postselection are achieved via spatially varying polarization control, which can be tailored to optimize the sensitivity to parameter variations. Initial experiments for the two-parameter case demonstrate that this method can be used to measure physical parameters with resolutions at least 1000 times smaller than the wavelength of illumination. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.123603 | DOI Listing |

Phys Rev Lett 2019 Mar;122(12):128005

Institute for Multiscale Simulation, Friedrich-Alexander-University Erlangen-Nürnberg, Cauerstrasse 3, 91058 Erlangen, Germany.

Colloids are rarely perfectly uniform but follow a distribution of sizes, shapes, and charges. This dispersity can be inherent (static) or develop and change over time (dynamic). Despite a long history of research, the conditions under which nonuniform particles crystallize and which crystal forms is still not well understood. Read More

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Phys Rev Lett 2019 Mar;122(12):122701

Institute for Nuclear Theory and Department of Physics, University of Washington, Seattle, Washington 98195, USA.

We consider quarkyonic matter to naturally explain the observed properties of neutron stars. We argue that such matter might exist at densities close to that of nuclear matter, and at the onset, the pressure and the sound velocity in quarkyonic matter increase rapidly. In the limit of large number of quark colors N_{c}, this transition is characterized by a discontinuous change in pressure as a function of baryon number density. Read More

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Phys Rev Lett 2019 Mar;122(12):122001

Department of Physics, University of California at San Diego, La Jolla, California 92093, USA.

If physics beyond the standard model enters well above the electroweak scale, its low-energy effects are described by standard model effective field theory. Already, at dimension 6, many operators involve the antisymmetric quark tensor q[over ¯]σ^{μν}q, whose matrix elements are difficult to constrain from experiment, Ward identities, or low-energy theorems, in contrast to the corresponding vector and axial-vector or even scalar and pseudoscalar currents. However, with normalizations determined from lattice QCD, analyticity and unitarity often allow one to predict the momentum dependence in a large kinematic range. Read More

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March 2019

Phys Rev Lett 2019 Mar;122(12):121101

Department of Physics and Astronomy, University of California, Los Angeles Los Angeles, California 90095-1547, USA.

Neutron-rich material ejected from neutron star-neutron star (NS-NS) and neutron star-black-hole (NS-BH) binary mergers is heated by nuclear processes to temperatures of a few hundred keV, resulting in a population of electron-positron pairs. Some of the positrons escape from the outer layers of the ejecta. We show that the population of low-energy positrons produced by NS-NS and NS-BH mergers in the Milky Way can account for the observed 511-keV line from the Galactic center (GC). Read More

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Phys Rev Lett 2019 Mar;122(12):126601

CeFEMA, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal.

We investigate the phase diagram of the Haldane-Falicov-Kimball model-a model combining topology, interactions, and spontaneous disorder at finite temperatures. Using an unbiased numerical method, we map out the phase diagram on the interaction-temperature plane. Along with known phases, we unveil an insulating charge ordered state with gapless excitations and a temperature-driven gapless topological insulating phase. Read More

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March 2019

Phys Rev Lett 2019 Mar;122(12):127207

Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan.

We have experimentally studied a magnetopiezoelectric effect predicted recently for magnetic metals with low crystal symmetries. In EuMnBi_{2} with antiferromagnetic Mn moments at 77 K, dynamic displacements emerge along the a direction upon application of ac electric fields in the c direction and increase in proportion to the applied electric fields. Such displacements are not observed along the c direction of EuMnBi_{2} or EuZnBi_{2} with nonmagnetic Zn ions. Read More

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Phys Rev Lett 2019 Mar;122(12):121803

University of Wisconsin-Madison, Madison, Wisconsin, USA.

This Letter describes a search for Higgs boson pair production using the combined results from four final states: bbγγ, bbττ, bbbb, and bbVV, where V represents a W or Z boson. The search is performed using data collected in 2016 by the CMS experiment from LHC proton-proton collisions at sqrt[s]=13 TeV, corresponding to an integrated luminosity of 35.9 fb^{-1}. Read More

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