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arXiv 2401.14501cond-mat.supr-concond-mat.mes-hallquant-ph
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通过光揭示p波超导线的拓扑特征

Topological signatures of a p-wave superconducting wire through light

Frederick Del Pozo, Karyn Le Hur

AI总结:

本文提出利用电磁波驱动p波超导线,通过光诱导跃迁概率、准粒子布居、电容响应和约瑟夫森电流来测量$\mathbb{Z}_{2}$拓扑不变量并探测拓扑相变,还可在布洛赫球上实现替代测量方案。

摘要:

我们展示了如何通过经典矢量势(即电磁波)驱动,利用光诱导的跃迁概率和诱导准粒子布居的分布,来揭示一维拓扑p波超导体的$\mathbb{Z}_{2}$拓扑指标。作为驱动频率$ω$的函数,可以从共振包络中获得该拓扑不变量的度量,从而对短程Kitaev线的两种不同拓扑相进行分类。我们提出通过光场存在下全局电容的响应,以及通过导线与邻近耦合体超导体之间的约瑟夫森电流,来探测模型中的拓扑相变。该系统还可以在布洛赫球上实现,从而通过电路或腔量子电动力学提供测量$\mathbb{Z}$和$\mathbb{Z}_2$拓扑不变量的替代方法。

英文摘要:

We show how the $\mathbb{Z}_{2}$ topological index of a one-dimensional topological p-wave superconductor can be revealed when driving with a classical vector potential i.e. an electromagnetic wave, through the light-induced transition probabilities and the profile of the induced quasiparticles population. As a function of driving frequency $ω$, it is possible to obtain a measure of this topological invariant from the resonance envelope classifying the two distinct topological phases of the short-range Kitaev wire. We propose to probe the topological phase transition in the model through the responses of the global capacitance in the presence of the light field and through the Josephson current between the wire and the proximity coupled bulk superconductor. The system may also be implemented on the Bloch sphere allowing alternative ways to measure the $\mathbb{Z}$ and $\mathbb{Z}_2$ topological invariants through circuit or cavity quantum electrodynamics.

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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