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Persistent quantum resonance transition in spin Hall transport

机译:自旋霍尔输运中的持久量子共振跃迁

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摘要

We propose an H-shaped two-dimensional topological insulator (2DTI) as a persistent quantum resonance device. The helical edge states of 2DTI are robust against a nonmagnetic field. However, the helical edge states interfere with bound states created by a nonmagnetic impurity. Transmissions between leads shows two kinds of quantum resonance in this device, the Breit-Wigner resonance and a Fano-like resonance. These resonances can be realized in the device through modulating the on-site impurity potential. Resonances in 2DTI are persistent because the helical state has no backscattering that is protected by time-reversal-symmetry conservation. The finite-size effect in 2DTI leads to the phase transition between the Fano and the Breit-Wigner resonances through modulating the thickness of the 2DTI leads.
机译:我们提出了一种H型二维拓扑绝缘体(2DTI)作为持久性量子共振装置。 2DTI的螺旋边缘状态对于非磁场具有鲁棒性。但是,螺旋边缘状态会干扰由非磁性杂质产生的结合状态。导线之间的传输显示了该设备中的两种量子共振,即Breit-Wigner共振和Fano类共振。这些谐振可以通过调制现场杂质电势在设备中实现。 2DTI中的共振是持久的,因为螺旋状态没有反向散射,时间反向对称守恒可以保护该反向散射。 2DTI中的有限尺寸效应通过调制2DTI引线的厚度导致Fano和Breit-Wigner共振之间的相变。

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  • 来源
    《Physical review》 |2016年第3期|035405.1-035405.6|共6页
  • 作者单位

    Department of Physics, National Taiwan University, Taipei 10617, Taiwan;

    Department of Physics, National Taiwan University, Taipei 10617, Taiwan;

    Department of Physics, National Taiwan University, Taipei 10617, Taiwan;

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