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arXiv 2009.06174cond-mat.mes-hallphysics.opticsquant-ph
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光力学系统中的拓扑声子输运

Topological phonon transport in an optomechanical system

Hengjiang Ren, Tirth Shah, Hannes Pfeifer, Christian Brendel, Vittorio Peano, Florian Marquardt, Oskar Painter

AI总结:

本文在含800多个腔光力学元件的光力学晶体阵列中实验观测到0.325–0.34 GHz拓扑边缘声子输运,证明其背向散射显著降低,为纳米级鲁棒高超声频声子电路奠定基础。

摘要:

腔光力学的最新进展使得光不仅可以作为机械运动的被动测量装置,还能够操控机械对象的运动,直至单个振动量子(声子)的层面。与此同时,微加工技术已使小规模光力学电路能够在芯片上操控机械和光学信号。在这些发展的基础上,理论提案表明,更大规模的光力学阵列可用于改变声子的传播,实现一种受拓扑保护的声子输运。在这里,我们报道在由超过800个腔光力学元件组成的多尺度光力学晶体结构中观测到拓扑声子输运。利用灵敏的空间分辨光学读出,我们探测到0.325–0.34 GHz频段内的热声子沿拓扑边缘通道传播,并且背向散射显著减少。这代表着从开创性的宏观机械系统工作迈向纳米尺度拓扑声子系统的重要一步;在该尺度上,可实现由鲁棒延迟线和非互易元件组成的高超声频(≳GHz)声波电路。由于拓扑通道具有宽带特性,尽管是在低温条件下,控制携带热量的声子流动也是可以设想的。

英文摘要:

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 ($\gtrsim$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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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