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arXiv 1203.4486cond-mat.mes-hallcond-mat.str-el
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通过扩展接触实现螺旋边缘状态之间的调谐

Tunneling between helical edge states through extended contacts

G. Dolcetto, S. Barbarino, D. Ferraro, N. Magnoli, M. Sassetti

摘要:

我们考虑一个量子自旋霍尔系统在一个双终端设置,与一个扩展的隧道连接的上,下边缘。我们分析了这种几何形状对背散射电流的影响,作为电压,温度和电子相互作用强度的函数。我们发现,这种配置可能是有用的,以确认边缘状态的螺旋性质,并提取其传播速度。通过与通常的量子点接触几何的比较,我们观察到,预测的反向散射电流和线性电导的幂律行为恢复足够低的能量,而不同的幂律也出现在更高的能量。

英文摘要:

We consider a quantum spin Hall system in a two-terminal setup, with an extended tunneling contact connecting upper and lower edges. We analyze the effects of this geometry on the backscattering current as a function of voltage, temperature, and strength of the electron interactions. We find that this configuration may be useful to confirm the helical nature of the edge states and to extract their propagation velocity. By comparing with the usual quantum point contact geometry, we observe that the power-law behaviors predicted for the backscattering current and the linear conductance are recovered for low enough energies, while different power-laws also emerge at higher energies.

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。

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