论文标题
Fabry-Pérot干扰2D低密度Rashba气体
Fabry-Pérot interference in 2D low-density Rashba gas
论文作者
论文摘要
在介观电子系统中，在各种一维设备中观察到Fabry-Pérot（FP）振荡。至于较高的维度，许多横向通道通常会导致脱落，从而消除电导的整体振荡。到目前为止，仅在基于石墨烯的设备中报道了2D电子系统中的FP振荡，最近，iNvered Inas/gasb double Quantum井的\ emph {pn}连接[phys [phys。修订版X 10，031007（2020）]。在后者中，Sombrero Hat的带状效果起着至关重要的作用，它引入了2D FP振荡的电子孔杂交机理。在这项工作中，我们建议可以将这种情况推广到由低密度Rashba气体组成的2D平面连接处，在该连接中，乐队的底部也具有Sombrero帽子的形状。我们表明，外部和内部费米圆之间的反向散射主导了FP干扰，并显着抑制了不同横向通道之间的脱位效应，从而导致隧道电导的可见振荡。特别是，与INAS/GASB双重量子井中相比，振荡模式的可见性可以通过应用界面屏障来增强。我们的结果为2D电子气体中FP振荡的实施提供了一种有希望的方法。
In mesoscopic electronic systems, the Fabry-Pérot (FP) oscillation is observed in various 1D devices. As for higher dimensions, numerous transverse channels usually lead to dephasing that quenches the overall oscillation of the conductance. Up to now, the FP oscillation in 2D electronic systems is only reported in graphene-based devices, and very recently, the \emph{pn} junctions of inverted InAs/GaSb double quantum well [Phys. Rev. X 10, 031007 (2020)]. In the latter, the band shape of a sombrero hat plays an essential role, which introduces a novel mechanism of electron-hole hybridization for the 2D FP oscillation. In this work, we propose that such a scenario can be generalized to the 2D planar junction composed of low-density Rashba gas, where the band bottom possesses a sombrero hat shape as well. We show that the backscattering between the outer and inner Fermi circles dominates the FP interference and significantly suppresses the dephasing effect between different transverse channels, which leads to a visible oscillation of the tunneling conductance. Specially, the visibility of the oscillating pattern can be enhanced by applying interface barriers, in contrast to that in the InAs/GaSb double quantum well. Our results provide a promising way for the implementation of the FP oscillation in the 2D electron gas.
