arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1405.5973cond-mat.mes-hall
收藏

非平衡边缘态隧穿的动力学

Dynamics of tunneling into nonequilibrium edge states

Benjamin M. Fregoso, Jan P. Dahlhaus, Joel E. Moore

摘要:

与时间相关的微扰可以将平凡的二维带绝缘体驱动到量子霍尔相,并将受保护的非平衡态束缚在其边缘。我们提出了一个实验来探测这些拓扑边缘状态的存在,其中包括通过一个小的二维样品的隧道电流的平衡。的签名是一个非量化的金属电导附近的边缘的样品,相反,在散装的激发间隙。这一建议的情况下,证明了一个二维晶格模型的狄拉克电子与可调质量在强电磁场。此外,我们还研究了驱动共振能级模型的隧穿电导,发现了类似于动力学局域化的现象,其中某些输运通道被抑制。

英文摘要:

Time-dependent perturbations can drive a trivial two-dimensional band insulator into a quantum Hall-like phase, with protected nonequilibrium states bound to its edges. We propose an experiment to probe the existence of these topological edge states which consists of passing a tunneling current through a small two-dimensional sample out of equilibrium. The signature is a nonquantized metallic conductance near the edges of the sample and, in contrast, an excitation gap in the bulk. This proposal is demonstrated for the case of a two-dimensional lattice model of Dirac electrons with tunable mass in a strong electromagnetic field. In addition, we also study the tunneling conductance of the driven resonant level model and find a phenomenon similar to dynamic localization in which certain transport channels are suppressed.

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。

↑