半导体pn结中负折射引起的量子隐形现象
Hidden quantum mirage by negative refraction in semiconductor P-N junctions
摘要：
基于半导体pn结的负折射效应，我们预测了一种新的量子干涉现象：在结的一侧有一个局域泵浦，另一侧的局域探测的响应表现为扰动不是来自泵浦，而是来自结的镜像。这种现象通过系统的平移不变性和组成材料的费米表面的匹配来保证，因此它对结的其他细节（例如，结宽度、电势分布以及甚至无序）。最近在二维半导体中制备的pn结为探索这一现象及其在显著增强电荷和自旋输运以及载流子介导的长程关联方面的应用提供了理想的平台。
英文摘要：
We predict a novel quantum interference based on the negative refraction across a semiconductor P-N junction: with a local pump on one side of the junction, the response of a local probe on the other side behaves as if the disturbance emanates not from the pump but instead from its mirror image about the junction. This phenomenon is guaranteed by translational invariance of the system and matching of Fermi surfaces of the constituent materials, thus it is robust against other details of the junction (e.g., junction width, potential profile, and even disorder). The recently fabricated P-N junctions in 2D semiconductors provide ideal platforms to explore this phenomenon and its applications to dramatically enhance charge and spin transport as well as carrier-mediated long-range correlation.
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