Electrical modulation of the edge channel transport in topological insulators coupled to ferromagnetic leads
Electrical modulation of the edge channel transport in topological insulators coupled to ferromagnetic leads
复制标题
与铁磁引线耦合的拓扑绝缘体中边缘通道传输的电调制
DOI：
10.1063/1.4754425
复制
发表时间：
2012-08
影响因子：
3.2
通讯作者：
Zhou, GuangHui
中科院分区：
文献类型：
--
作者：
Li, Yuan;Jalil, M. B. A.;Tan, Seng Ghee;Zhou, GuangHui
The counterpropagating edge states of a two-dimensional topological insulator (TI) carry electrons of opposite spins. We investigate the transport properties of edge states in a two-dimensional TI which is contacted to ferromagnetic leads. The application of a side-gate voltage induces a constriction or quantum point contact (QPC) which couples the two edge channels. The transport properties of the system are calculated via the Keldysh nonequilibrium Green's function method. We found that inter-edge spin-flip coupling can significantly enhance (suppress) the charge current when the magnetization of the leads are anti-parallel (parallel) to one another. On the other hand, spin-conserving inter-edge coupling generally reduces the current by backscattering regardless of the magnetization configuration. The charge current and the conductance as a function of the bias voltage, also exhibit similar trends with respect to spin-flip coupling strength, for both parallel and anti-parallel configurations. Hence, gat...
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影响因子：
56.9
作者：
Bernevig, B. Andrei;Hughes, Taylor L.;Zhang, Shou-Cheng
通讯作者：
Zhang, Shou-Cheng
影响因子：
56.9
作者：
Koenig, Markus;Wiedmann, Steffen;Zhang, Shou-Cheng
通讯作者：
Zhang, Shou-Cheng
影响因子：
2.3
作者：
Fujita, Takashi;Jalil, Mansoor Bin Abdul;Tan, Seng Ghee
通讯作者：
Tan, Seng Ghee
影响因子：
3.7
作者：
Ivan Knez;R. Du;G. Sullivan
通讯作者：
Ivan Knez;R. Du;G. Sullivan
影响因子：
8.6
作者：
MEIR, Y;WINGREEN, NS
通讯作者：
WINGREEN, NS