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  Topological phonon transport in an optomechanical system

Ren, H., Shah, T., Pfeifer, H., Brendel, C., Peano, V., Marquardt, F., et al. (2020). Topological phonon transport in an optomechanical system. arXiv, 2009.06174.

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 Creators:
Ren, Hengjiang1, 2, 3, Author
Shah, Tirth4, 5, Author
Pfeifer, Hannes4, Author              
Brendel, Christian4, Author              
Peano, Vittorio4, Author              
Marquardt, Florian4, 5, Author              
Painter, Oskar1, 2, 3, 6, Author
Affiliations:
1Thomas J. Watson, Sr., Laboratory of Applied Physics,California Institute of Technology, Pasadena, California 91125, USA, ou_persistent22              
2Kavli Nanoscience Institute, California Institute of Technology, Pasadena, California 91125, USA, ou_persistent22              
3nstitute for Quantum Information and Matter,California Institute of Technology, Pasadena, California 91125, USA, ou_persistent22              
4Marquardt Division, Max Planck Institute for the Science of Light, Max Planck Society, ou_2421700              
5Department of Physics, Friedrich-Alexander Universität Erlangen-Nürnberg, Staudtstrasse 7, 91058 Erlangen, Germany, ou_persistent22              
6AWS Center for Quantum Computing, Pasadena, California 91125, USA, ou_persistent22              

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 Abstract: Recent advances in cavity-optomechanics have now made it possible to use light not just as a passive measuring device of mechanical motion, but also to manipulate the motion of mechanical objects down to the level of individual quanta of vibrations (phonons). At the same time, microfabrication techniques have enabled small-scale optomechanical circuits capable of on-chip manipulation of mechanical and optical signals. Building on these developments, theoretical proposals have shown that larger scale optomechanical arrays can be used to modify the propagation of phonons, realizing a form of topologically protected phonon transport. Here, we report the observation of topological phonon transport within a multiscale optomechanical crystal structure consisting of an array of over 800 cavity-optomechanical elements. Using sensitive, spatially resolved optical read-out we detect thermal phonons in a 0.325−0.34GHz band traveling along a topological edge channel, with substantial reduction in backscattering. This represents an important step from the pioneering macroscopic mechanical systems work towards topological phononic systems at the nanoscale, where hypersonic frequency (≳GHz) acoustic wave circuits consisting of robust delay lines and non-reciprocal elements may be implemented. Owing to the broadband character of the topological channels, the control of the flow of heat-carrying phonons, albeit at cryogenic temperatures, may also be envisioned.

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Language(s): eng - English
 Dates: 2020-09-142020-09-14
 Publication Status: Published online
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 Identifiers: arXiv: 2009.06174
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