论文标题
介镜异质结中非临界电荷和自旋转运。
Nonreciprocal Charge and Spin Transport Induced by Non-Hermitian Skin Effect in Mesoscopic Heterojunctions
论文作者
论文摘要
在各种物理系统中追求非铁皮皮肤效应（NHSE）具有极大的研究兴趣。与非电子系统的最新进展相比，NHSE在冷凝物质物理学中的实施仍然难以捉摸。在这里，我们表明NHSE可以在介质异质界（系统加上储层）中进行设计，其中在系统的两个通道中的电子相互向彼此移动的电子与储层的耦合不对称。这使系统中的电子向前移动，并且在相反的方向上具有不平等的寿命，因此产生了点间隙频谱拓扑。因此，电子特征态在开放边界条件下表现出NHSE，与广义布里鲁因区的描述一致。这种储层工程的NHSE明显表现为可以通过标准运输测量值探测的非偏射电荷电流。此外，我们将场景概括为自旋分辨的NHSE，可以通过非偏置自旋转运来探测。我们的工作开辟了一条新的研究途径，用于在电子介观系统中实施和检测NHSE，这将导致有趣的设备应用。
The pursuit of the non-Hermitian skin effect (NHSE) in various physical systems is of great research interest. Compared with recent progress in non-electronic systems, the implementation of the NHSE in condensed matter physics remains elusive. Here, we show that the NHSE can be engineered in the mesoscopic heterojunctions (system plus reservoir) in which electrons in two channels of the system moving towards each other have asymmetric coupling to those of the reservoir. This makes electrons in the system moving forward and in the opposite direction have unequal lifetimes, and so gives rise to a point-gap spectral topology. Accordingly, the electron eigenstates exhibit NHSE under the open boundary condition, consistent with the description of the generalized Brillouin zone. Such a reservoir-engineered NHSE visibly manifests itself as the nonreciprocal charge current that can be probed by the standard transport measurements. Further, we generalize the scenario to the spin-resolved NHSE, which can be probed by the nonreciprocal spin transport. Our work opens a new research avenue for implementing and detecting the NHSE in electronic mesoscopic systems, which will lead to interesting device applications.
