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Topological phonon transport in an optomechanical system

Ren, Hengjiang and Shah, Tirth and Pfeifer, Hannes and Brendel, Christian and Peano, Vittorio and Marquardt, Florian and Painter, Oskar (2020) Topological phonon transport in an optomechanical system. . (Unpublished)

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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 0.325-0.34 GHz 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.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Pfeifer, Hannes0000-0002-1713-6102
Peano, Vittorio0000-0003-1931-5080
Marquardt, Florian0000-0003-4566-1753
Painter, Oskar0000-0002-1581-9209
Additional Information:The authors would like to thank Sameer Sonar and Utku Hatipoglu for the help with nanofabrication and measurement. This work was supported by the Gordon and Betty Moore Foundation (award #7435) and the Kavli Nanoscience Institute at Caltech. H.R. was supported by the National Science Scholarship from A*STAR, Singapore. T.S. and F.M. acknowledge support from the European Unions Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. (OMT). V.P. acknowledges support by the Julian Schwinger Foundation (Grant No. JSF-16-03-0000). F.M. acknowledges support from the European Unions Horizon 2020 Research and Innovation program under Grant No. 732894, Future and Emerging Technologies (FET)-Proactive Hybrid Optomechanical Technologies (HOT).
Group:Institute for Quantum Information and Matter, Kavli Nanoscience Institute
Funding AgencyGrant Number
Gordon and Betty Moore Foundation7435
Kavli Nanoscience InstituteUNSPECIFIED
Agency for Science, Technology and Research (A*STAR)UNSPECIFIED
Marie Curie Fellowship722923
Julian Schwinger FoundationJSF-16-03- 0000
European Research Council (ERC)732894
Record Number:CaltechAUTHORS:20200915-092939162
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105384
Deposited By: Joy Painter
Deposited On:15 Sep 2020 17:55
Last Modified:15 Sep 2020 17:55

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