Publications by authors named "Kristina Weinel"

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Tunable Graphene Phononic Crystal.

Nano Lett 2021 Mar 23;21(5):2174-2182. Epub 2021 Feb 23.

Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.

In the field of phononics, periodic patterning controls vibrations and thereby the flow of heat and sound in matter. Bandgaps arising in such phononic crystals (PnCs) realize low-dissipation vibrational modes and enable applications toward mechanical qubits, efficient waveguides, and state-of-the-art sensing. Here, we combine phononics and two-dimensional materials and explore tuning of PnCs via applied mechanical pressure. To this end, we fabricate the thinnest possible PnC from monolayer graphene and simulate its vibrational properties. We find a bandgap in the megahertz regime within which we localize a defect mode with a small effective mass of 0.72 ag = 0.002 m. We exploit graphene's flexibility and simulate mechanical tuning of a finite size PnC. Under electrostatic pressure up to 30 kPa, we observe an upshift in frequency of the entire phononic system by ∼350%. At the same time, the defect mode stays within the bandgap and remains localized, suggesting a high-quality, dynamically tunable mechanical system.
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http://dx.doi.org/10.1021/acs.nanolett.0c04986DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7953378PMC
March 2021
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