论文标题
稳态直流通过安德森杂质连接，并与旋转轨道耦合相连
Steady-state dc transport through an Anderson impurity coupled to leads with spin-orbit coupling
论文作者
论文摘要
我们研究了一个由相互作用的量子点组成的系统的稳态直流传输特性，该系统以Anderson杂质建模，与Rashba Soc的两个金属非相互作用的导线耦合，并使用插入性逆转方法（IPA）。单粒子光谱，电流和差分电导是在较大的SOC和偏置值的弱耦合方案中获得的。 IPA的广泛基准测试验证了线性和非线性响应方案中的方法。通用的零偏见（$ v_ {sd} = 0 $）峰值与近距比例成比例的宽度（$ t_k $）和两个非宇宙有限偏见在$ v_ {sd} = \ pm u $左右左右，在零温度下，零温度的电导率显示出明显的分离，显示出$ $ u $ $ $ $ $ $ $ $ $ $。在强耦合方面，升高温度会诱导零偏置峰的熔化，从而导致从三峰电导到两峰电导的交叉。最近的实验通过在固定温度下增加SOC来发现两峰结构的出现。我们的结果似乎对这些观察结果提供了定性的解释，作为从弱/中间到强耦合的SOC调整的交叉，以及从低$ t/t_k $到高$ t/t_k $比率的同时交叉。我们还重现了零偏置电导的实验观察到的温度依赖性。
We study the steady-state dc transport characteristics of a system comprised of an interacting quantum dot, modelled as an Anderson impurity, coupled to two metallic non-interacting leads with Rashba SOC, using an interpolative perturbative approach (IPA). The single-particle spectra, current and differential conductance are obtained in weak and strong coupling regimes over a wide range of SOC and bias values. Extensive benchmarking of the IPA validates the method in the linear as well as non-linear response regime. The universal, zero bias ($V_{sd}=0$) peak with a width proportional to the Kondo scale ($T_K$) and two non-universal finite bias peaks around $V_{sd}=\pm U$ in the zero temperature differential conductance show a clear separation with increasing $U$ or increasing SOC. In the strong coupling regime, increasing temperature induces melting of the zero bias peak leading to a crossover from a three-peak conductance to a two-peak conductance. Recent experiments find the emergence of a two-peak structure by increasing SOC at a fixed temperature. Our results appear to provide a qualitative explanation of these observations as a SOC tuned crossover from weak/intermediate to strong coupling, and a simultaneous crossover from low $T/T_K$ to high $T/T_K$ ratio. We also reproduce the experimentally observed temperature dependence of the zero bias conductance.
