Publications by authors named "Eddy Collin"

4 Publications

  • Page 1 of 1

High- Silicon Nitride Drum Resonators Strongly Coupled to Gates.

Nano Lett 2021 Jul 16;21(13):5738-5744. Epub 2021 Jun 16.

Université Grenoble Alpes, Institut NEEL, CNRS UPR2940, 25 rue des Martyrs, BP 166, 38042 Grenoble Cedex 9, France.

Silicon nitride (SiN) mechanical resonators with high quality mechanical properties are attractive for fundamental research and applications. However, it is challenging to maintain these mechanical properties while achieving strong coupling to an electrical circuit for efficient on-chip integration. Here, we present a SiN drum resonator covered with an aluminum thin film, enabling large capacitive coupling to a suspended top-gate. Implementing the full electrical measurement scheme, we demonstrate a high quality factor ∼10 (comparable to that of bare drums at room temperature) and present our ability to detect ∼10 mechanical modes at low temperature. The drum resonator is also coupled to a microwave cavity, so that we can perform optomechanical sideband pumping with a fairly good coupling strength and demonstrate mechanical parametric amplification. This SiN drum resonator design provides efficient electrical integration and exhibits promising features for exploring mode coupling and signal processing.
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http://dx.doi.org/10.1021/acs.nanolett.1c01477DOI Listing
July 2021

Heat conduction measurements in ballistic 1D phonon waveguides indicate breakdown of the thermal conductance quantization.

Nat Commun 2018 10 16;9(1):4287. Epub 2018 Oct 16.

Institut NÉEL, CNRS, 25 avenue des Martyrs, 38042, Grenoble, France.

Emerging quantum technologies require mastering thermal management, especially at the nanoscale. It is now accepted that thermal metamaterial-based phonon manipulation is possible, especially at sub-kelvin temperatures. In these extreme limits of low temperatures and dimensions, heat conduction enters a quantum regime where phonon exchange obeys the Landauer formalism. Phonon transport is then governed by the transmission coefficients between the ballistic conductor and the thermal reservoirs. Here we report on ultra-sensitive thermal experiments made on ballistic 1D phonon conductors using a micro-platform suspended sensor. Our thermal conductance measurements attain a power sensitivity of 15 attoWatts [Formula: see text] around 100 mK. Ballistic thermal transport is dominated by non-ideal transmission coefficients and not by the quantized thermal conductance of the nanowire itself. This limitation of heat transport in the quantum regime may have a significant impact on modern thermal management and thermal circuit design.
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http://dx.doi.org/10.1038/s41467-018-06791-0DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6191430PMC
October 2018

Measuring Frequency Fluctuations in Nonlinear Nanomechanical Resonators.

ACS Nano 2018 Jun 16;12(6):5753-5760. Epub 2018 May 16.

Université Grenoble Alpes, CNRS Institut Néel , BP 166, 38042 Grenoble Cedex 9 , France.

Advances in nanomechanics within recent years have demonstrated an always expanding range of devices, from top-down structures to appealing bottom-up MoS and graphene membranes, used for both sensing and component-oriented applications. One of the main concerns in all of these devices is frequency noise, which ultimately limits their applicability. This issue has attracted a lot of attention recently, and the origin of this noise remains elusive to date. In this article we present a very simple technique to measure frequency noise in nonlinear mechanical devices, based on the presence of bistability. It is illustrated on silicon-nitride high-stress doubly clamped beams, in a cryogenic environment. We report on the same T/ f dependence of the frequency noise power spectra as reported in the literature. But we also find unexpected damping fluctuations, amplified in the vicinity of the bifurcation points; this effect is clearly distinct from already reported nonlinear dephasing and poses a fundamental limit on the measurement of bifurcation frequencies. The technique is further applied to the measurement of frequency noise as a function of mode number, within the same device. The relative frequency noise for the fundamental flexure δ f/ f lies in the range 0.5-0.01 ppm (consistent with the literature for cryogenic MHz devices) and decreases with mode number in the range studied. The technique can be applied to any type of nanomechanical structure, enabling progress toward the understanding of intrinsic sources of noise in these devices.
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http://dx.doi.org/10.1021/acsnano.8b01634DOI Listing
June 2018

Specific heat measurement of thin suspended SiN membrane from 8 K to 300 K using the 3ω-Völklein method.

Rev Sci Instrum 2013 Sep;84(9):094902

Institut NÉEL, CNRS-UJF, 25 avenue des Martyrs, 38042 Grenoble Cedex 9, France.

We present a specific heat measurement technique adapted to thin or very thin suspended membranes from low temperature (8 K) to 300 K. The presented device allows the measurement of the heat capacity of a 70 ng silicon nitride membrane (50 or 100 nm thick), corresponding to a heat capacity of 1.4 × 10(-10) J/K at 8 K and 5.1 × 10(-8) J/K at 300 K. Measurements are performed using the 3ω method coupled to the Völklein geometry. This configuration allows the measurement of both specific heat and thermal conductivity within the same experiment. A transducer (heater/thermometer) is used to create an oscillation of the heat flux on the membrane; the voltage oscillation appearing at the third harmonic which contains the thermal information is measured using a Wheatstone bridge set-up. The heat capacity measurement is performed by measuring the variation of the 3ω voltage over a wide frequency range and by fitting the experimental data using a thermal model adapted to the heat transfer across the membrane. The experimental data are compared to a regular Debye model; the specific heat exhibits features commonly seen for glasses at low temperature.
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http://dx.doi.org/10.1063/1.4821501DOI Listing
September 2013
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