Quantum spin Hall effect in a square-lattice model under a uniform magnetic field

We study a toy square-lattice model under a uniform magnetic field. Using the Landauer Biittiker fornmla, we calculate the transport properties of the system on a two-terminal, a four-terminal and a six-terminM device. W＇e find that the quantum spin Hall （QSH） effect appears ill energy ranges where...

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Veröffentlicht in:	Chinese physics B 2012-07, Vol.21 (7), p.478-483, Article 077303
1. Verfasser:	郭怀明冯世半
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Sprache:	eng
Schlagworte:	Devices Fermi level Fermi surfaces Magnetic fields Mathematical models Origins Robustness Spin-orbit interactions Transport properties 均匀磁场子系统格子模型正方形能量范围费米能级量子自旋霍尔效应
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container_title	Chinese physics B
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creator	郭怀明冯世半
description	We study a toy square-lattice model under a uniform magnetic field. Using the Landauer Biittiker fornmla, we calculate the transport properties of the system on a two-terminal, a four-terminal and a six-terminM device. W＇e find that the quantum spin Hall （QSH） effect appears ill energy ranges where the spin-up and spin-down subsystems have different filling factors. We also study the robustness of the resulting QSH effect and find that it is robust when the Fermi levels of both spin subsystems are far away from the energy plateaus but is fragile when the Fermi level of any spin subsystem is near the energy plateaus. These results provide an example of the QSH effect with a physical origin other than time-reversal （TR） preserving spin-orbit coupling （SOC）.
doi_str_mv	10.1088/1674-1056/21/7/077303
format	Article
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subjects	Devices Fermi level Fermi surfaces Magnetic fields Mathematical models Origins Robustness Spin-orbit interactions Transport properties 均匀磁场子系统格子模型正方形能量范围费米能级量子自旋霍尔效应
title	Quantum spin Hall effect in a square-lattice model under a uniform magnetic field
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