AI 中文总结
该研究探究量子霍尔体系中手性安德烈夫边缘态的自旋特性，发现同自旋安德烈夫反射伴随自旋翻转，反射概率分布呈指数，在自旋极化ν=1情形下因粒子损耗观测到该现象，揭示了相关机制并强调非厄米性的重要性。
AI 中文摘要
超导体与拓扑材料的界面有望实现奇异态和元激发，一个重要例子是手性安德烈夫边缘态（CAES），其形成于量子霍尔（QH）态与超导体（SC）的界面，CAES结合了电子和空穴的振幅，这些振幅通过安德烈夫反射发生杂化。本研究通过对QH边缘通道的选择性自旋滤波，探究CAES的自旋特性，发现安德烈夫过程伴随自旋翻转的有力证据：电子可从超导体反射为同自旋通道的空穴，反射概率的分布呈指数形式，随后采用随机矩阵理论解释该观测结果，最终在自旋极化的ν=1情形下观测到安德烈夫反射，该现象由粒子损耗实现。本研究结果揭示了自旋极化手性态安德烈夫反射的潜在机制，也表明在构建混合材料拓扑超导体时，考虑非厄米性的重要性。
英文摘要
The interfaces of superconductors and topological materials hold promise for realizing exotic states and excitations. An important example is provided by the chiral Andreev edge states (CAES), which are formed at interfaces between quantum Hall (QH) states and superconductors (SC). CAES combine electron and hole amplitudes which are hybridized via Andreev reflections. This study explores the spin properties of the CAES through selective spin filtering of the QH edge channels. We find robust evidence of spin-flips accompanying the Andreev processes: electrons can be reflected from the superconductor as holes in the same spin channel. We demonstrate that the distribution of the reflection probabilities is exponential and then use random matrix theory to account for this observation. Finally, we observe Andreev reflections in the spin-polarized ν = 1 case, which is enabled by particle loss. Our findings shed light on the mechanism underlying Andreev reflections of spin-polarized chiral states. They also demonstrate the importance of considering non-Hermiticity when constructing topological superconductors in hybrid materials.
Comments19 pages, 10 figures
