Pseudomagnetic fields for sound at the nanoscale

There is a growing effort in creating chiral transport of sound waves. However, most approaches so far have been confined to the macroscopic scale. Here, we propose an approach suitable to the nanoscale that is based on pseudomagnetic fields. These pseudomagnetic fields for sound waves are the analo...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 114; no. 17; pp. E3390 - E3395
Main Authors Brendel, Christian, Peano, Vittorio, Painter, Oskar J., Marquardt, Florian
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 25.04.2017
SeriesPNAS Plus
Subjects
Crystals
Design modifications
Electrons
Magnetic fields
Physical Sciences
PNAS Plus
Sound waves
topological physics
nanomechanics
optomechanics
phononic crystal
pseudomagnetic field
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Summary:There is a growing effort in creating chiral transport of sound waves. However, most approaches so far have been confined to the macroscopic scale. Here, we propose an approach suitable to the nanoscale that is based on pseudomagnetic fields. These pseudomagnetic fields for sound waves are the analogue of what electrons experience in strained graphene. In our proposal, they are created by simple geometrical modifications of an existing and experimentally proven phononic crystal design, the snowflake crystal. This platform is robust, scalable, and well-suited for a variety of excitation and readout mechanisms, among them optomechanical approaches.
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Author contributions: V.P., O.J.P., and F.M. designed research; C.B., V.P., and F.M. performed research; C.B., V.P., and F.M. analyzed data; and C.B., V.P., O.J.P., and F.M. wrote the paper.
Edited by Tom C. Lubensky, University of Pennsylvania, Philadelphia, PA, and approved March 10, 2017 (received for review September 27, 2016)
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1615503114