拓扑绝缘体中的非对称Cherenkov声学反转
Asymmetric Cherenkov acoustic reverse in topological insulators
摘要：
在常规材料的光学或声学中已知的切伦科夫辐射的一般现象是在那些材料中分别形成由加速到光速或声速以上的粒子发射的光子或声子的前向锥。在这里，我们建议三维拓扑绝缘体作为一个独特的平台，从根本上探索和实际利用切伦科夫效应的声学方面。我们证明了在三维拓扑绝缘体表面施加面内磁场可以在临界磁场下将前向切伦科夫声抑制到零。在临界场之上，切伦科夫声音获得纯向后性质，其极分布不同于在临界场之下产生的向前分布。这种非对称切伦科夫反转的潜在应用是在低能量电子器件的设计中，例如声学棘轮，或者通常在具有对切伦科夫耗散的方向和幅度的磁场控制的电子电路的低功率设计中。
英文摘要：
A general phenomenon of the Cherenkov radiation known in optics or acoustics of conventional materials is a formation of a forward cone of, respectively, photons or phonons emitted by a particle accelerated above the speed of light or sound in those materials. Here we suggest three-dimensional topological insulators as a unique platform to fundamentally explore and practically exploit the acoustic aspect of the Cherenkov effect. We demonstrate that applying an in-plane magnetic field to a surface of a three-dimensional topological insulator one may suppress the forward Cherenkov sound up to zero at a critical magnetic field. Above the critical field the Cherenkov sound acquires pure backward nature with the polar distribution differing from the forward one generated below the critical field. Potential applications of this asymmetric Cherenkov reverse are in design of low energy electronic devices such as acoustic ratchets or, in general, in low power design of electronic circuits with a magnetic field control of the direction and magnitude of the Cherenkov dissipation.
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