Nonlocal tunneling spectroscopy of multiterminal semiconductor-superconductor hybrid devices is a powerful tool to investigate the Andreev bound states below the parent superconducting gap. We examine how to exploit both microscopic and geometrical symmetries of the system to extract information on the normal and Andreev transmission probabilities from the multiterminal electric or thermoelectric differential conductance matrix under the assumption of an electrostatic potential landscape independent of the bias voltages, as well as the absence of leakage currents. These assumptions lead to several symmetry relations on the conductance matrix. Next, by considering a numerical model of a proximitized semiconductor wire with spin-orbit coupling and two normal contacts at its ends, we show how such symmetries can be used to identify the direction and relative strength of Rashba versus Dresselhaus spin-orbit coupling. Finally, we study how a voltage-bias-dependent electrostatic potential as well as quasiparticle leakage breaks the derived symmetry relations and investigate characteristic signatures of these two effects.

中文翻译：

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多端半导体超导器件的电导矩阵对称性

多端半导体-超导体混合器件的非局域隧穿光谱是研究母超导间隙下方的安德烈夫束缚态的有力工具。我们研究了如何利用系统的微观和几何对称性来从多端电或热电微分电导矩阵中提取有关正常和 Andreev 传输概率的信息，假设静电势景观独立于偏置电压，以及没有泄漏电流。这些假设导致了电导矩阵上的几个对称关系。接下来，通过考虑具有自旋轨道耦合和末端两个法向触点的近似半导体线的数值模型，我们展示了如何使用这种对称性来识别 Rashba 与 Dresselhaus 自旋轨道耦合的方向和相对强度。最后，我们研究了依赖于电压偏置的静电势以及准粒子泄漏如何破坏导出的对称关系并研究这两种效应的特征特征。