具有Rashba和Dresselhaus自旋轨道耦合的二维超导体的超导电性
Superconductivity in a two-dimensional superconductor with Rashba and Dresselhaus spin-orbit couplings
摘要：
我们提出了一个具有Rashba和Dresselhaus自旋轨道耦合的一般模型来描述二维非中心对称超导体。本文在平均场论的框架下研究了两种自旋轨道耦合对超导电性的联合作用。我们发现，Rashba和Dresselhaus自旋轨道耦合的结果类似的超导电性的影响，如果他们是单独存在于系统中。在假定每个准粒子带都是p波对的情况下，我们导出了电子带中自旋-单重态和三重态配对的混合。如果这两种类型的自旋轨道耦合联合出现，则单重态和三重态配对都会被削弱并降低到等Rashba-Dresselhaus情况下的最小值。
英文摘要：
We present a general model with both Rashba and Dresselhaus spin-orbit couplings to describe a two-dimensional noncentrosymmetric superconductor. The combined effects of the two spin-orbit couplings on superconductivity are investigated in the framework of mean-field theory. We find that the Rashba and Dresselhaus spin-orbit couplings result in similar effects on superconductivity if they are present solely in the system. Mixing of spin-singlet and triplet pairings in electron band is induced under the assumption that each quasiparticle band is p-wave paired. If the two types of spin-orbit couplings appear jointly, both the singlet and triplet pairings are weakened and decreased down to their minimum values in the equal-Rashba-Dresselhaus case.
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