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arXiv 1503.07167cond-mat.quant-gasquant-ph
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短寿命原子系统拓扑相变的动力学探测

Dynamical Detection of Topological Phase Transitions in Short-Lived Atomic Systems

F. Setiawan, K. Sengupta, I. B. Spielman, Jay D. Sau

摘要:

我们表明,动力学探针提供了直接的手段,检测常规和拓扑相位之间的拓扑相变(TPT),否则将难以访问,因为损失或加热过程。我们建议,以避免这种加热迅速淬火和短暂的拓扑阶段跨越过渡,支持无隙激发。淬火后,在最后的常规阶段的激励的分布携带的TPT的签名。我们采用这种策略来研究TPT到一个马约拉纳携带拓扑相预测在一维自旋轨道耦合费米气体的吸引相互作用。由此产生的自旋分辨的动量分布,通过自洽求解时间相关的Bogoliubov--de Gennes方程计算,表现出Kibble-Zurek标度和Stückelberg振荡特性的TPT。我们讨论参数制度的TPT是实验访问。

英文摘要:

We demonstrate that dynamical probes provide direct means of detecting the topological phase transition (TPT) between conventional and topological phases, which would otherwise be difficult to access because of loss or heating processes. We propose to avoid such heating by rapidly quenching in and out of the short-lived topological phase across the transition that supports gapless excitations. Following the quench, the distribution of excitations in the final conventional phase carries signatures of the TPT. We apply this strategy to study the TPT into a Majorana-carrying topological phase predicted in one-dimensional spin-orbit-coupled Fermi gases with attractive interactions. The resulting spin-resolved momentum distribution, computed by self-consistently solving the time-dependent Bogoliubov--de Gennes equations, exhibits Kibble-Zurek scaling and Stückelberg oscillations characteristic of the TPT. We discuss parameter regimes where the TPT is experimentally accessible.

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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