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1 August 2021 Non-Hermitian chiral phononics through optomechanical interactions
Ewold Verhagen
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Proceedings Volume 11796, Active Photonic Platforms XIII; 117961M (2021) https://doi.org/10.1117/12.2594644
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States
Abstract
We study the emergence of nonreciprocal and topologically nontrivial phonon transport in nano-optomechanical networks. We develop on-chip nanophotonic systems in which multiple mechanical modes are strongly coupled through radiation pressure. Through temporal modulation and retardation, suitable laser control fields can break time-reversal symmetry and introduce controlled gain and loss at will on any of the network link and nodes. We reveal the emergence of nanomechanical circulation, helical quantum Hall states, and chiral thermal transport. Exploiting optomechanical gain, we study the combination of broken time-reversal symmetry and non-Hermiticity. This leads to rich phenomenology including magnetic-field tuning of exceptional points and unidirectional phononic amplification. It promises to serve as building blocks for new bosonic topological phases in the domain of nanomechanics, which is rich in applications in sensing and signal processing.
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Ewold Verhagen "Non-Hermitian chiral phononics through optomechanical interactions", Proc. SPIE 11796, Active Photonic Platforms XIII, 117961M (1 August 2021); https://doi.org/10.1117/12.2594644
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KEYWORDS
Beam controllers
Modulation
Nanophotonics
Phonons
Signal processing
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