arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.5286cond-mat.mes-hallcond-mat.str-el
收藏

量子自旋霍尔反点诱导自旋极化电流的产生与控制

Generating and controlling spin-polarized currents induced by a quantum spin Hall antidot

Giacomo Dolcetto, Fabio Cavaliere, Dario Ferraro, Maura Sassetti

摘要:

我们研究了嵌入二维拓扑绝缘棒中的电控量子自旋霍尔反点。螺旋边缘状态周围的反点和沿边缘的酒吧隧道耦合。自旋和手征之间的紧密联系,典型的螺旋系统,允许产生一个自旋极化电流流过酒吧。通过改变势垒之间的不对称性,将该电流作为外部电压的函数进行研究。对于不对称的设置,观察到的自旋电流的切换行为的偏置增加,在电子相互作用的存在和不存在。该装置允许通过简单的电气手段产生和控制自旋极化电流。

英文摘要:

We study an electrically controlled quantum spin Hall antidot embedded in a two-dimensional topological insulating bar. Helical edge states around the antidot and along the edges of the bar are tunnel coupled. The close connection between spin and chirality, typical of helical systems, allows to generate a spin-polarized current flowing across the bar. This current is studied as a function of the external voltages, by varying the asymmetry between the barriers. For asymmetric setups, a switching behavior of the spin current is observed as the bias is increased, both in the absence and in the presence of electron interactions. This device allows to generate and control the spin-polarized current by simple electrical means.

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。

↑