Phonon condensation and cooling via nonlinear feedback
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arXiv
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| Format: | Preprint |
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2022
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| _version_ | 1866918439057096704 |
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| author | Zheng, Xu Li, Baowen |
| author_facet | Zheng, Xu Li, Baowen |
| contents | We propose a method to control the energy distribution in multimode mechanical systems using a single nonlinear feedback loop. We demonstrate that this feedback mechanism simultaneously amplifies the fundamental vibrational mode while suppressing all higher-order modes, effectively channeling energy into the lowest-frequency mode. This process mimics the energy redistribution of Fröhlich condensation but is achieved here through a designed feedback force that combines a ``low-pass gain'' and a ``high-pass loss''. In the feedback-induced steady state, the fundamental mode exhibits a phase-space distribution similar to that of a phonon laser, characterized by a ring shape and amplitude squeezing. Additionally, we show that the linewidth of the fundamental mode is narrowed by an order of magnitude, corresponding to a significant enhancement in phase coherence. This scheme offers a robust approach to generating coherent mechanical states and phonon lasing without the need for optical gain media or intrinsic material nonlinearities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2201_00251 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Phonon condensation and cooling via nonlinear feedback Zheng, Xu Li, Baowen Applied Physics We propose a method to control the energy distribution in multimode mechanical systems using a single nonlinear feedback loop. We demonstrate that this feedback mechanism simultaneously amplifies the fundamental vibrational mode while suppressing all higher-order modes, effectively channeling energy into the lowest-frequency mode. This process mimics the energy redistribution of Fröhlich condensation but is achieved here through a designed feedback force that combines a ``low-pass gain'' and a ``high-pass loss''. In the feedback-induced steady state, the fundamental mode exhibits a phase-space distribution similar to that of a phonon laser, characterized by a ring shape and amplitude squeezing. Additionally, we show that the linewidth of the fundamental mode is narrowed by an order of magnitude, corresponding to a significant enhancement in phase coherence. This scheme offers a robust approach to generating coherent mechanical states and phonon lasing without the need for optical gain media or intrinsic material nonlinearities. |
| title | Phonon condensation and cooling via nonlinear feedback |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2201.00251 |