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arXiv 1809.01591cond-mat.supr-con
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基于准经典理论的涡旋电荷和杂质效应

Vortex charge and impurity effects based on quasiclassical theory

Yusuke Masaki

摘要:

本文在准经典理论下研究了二维s波和手征p波超导体涡旋核周围的电荷密度。我们考虑的贡献,通过一阶的准经典参数的梯度展开,使用增广的准经典理论的粒子-空穴不对称性。根据Bogoliubov-de Gennes(BdG)方程,手征p波SC具有两个不等价的涡旋:一个是带电的,另一个是不带电的。我们也用增广的准经典理论解释了这种性质不同的电荷。此外,我们发现在干净的系统中,手征p波SC的带电涡旋比s波SC的带电涡旋诱导了更大的电荷。我们也证实了这种增强通过定量比较的结果的基础上BdG理论。我们还研究了玻恩型杂质的影响,使用自能形式主义,并发现,较大的电荷密度,而抑制在对比的s波的。此外,我们还研究了局域态密度作为粒子-空穴不对称性的另一个平衡性质。

英文摘要:

We investigate charge densities around the vortex cores of an s-wave and a chiral p-wave superconductor (SC) in two dimension within quasiclassical theory. We consider contributions of particle-hole asymmetry through gradient expansions in first order of a quasiclassical parameter using augmented quasiclassical theory. The chiral p-wave SC has two inequivalent vortices: one is charged and the other is uncharged on the basis of Bogoliubov--de Gennes (BdG) equation. We explain this qualitatively distinct charges also by the augmented quasiclassical theory. In addition, we find that much larger charge is induced for the charged vortex of the chiral p-wave SC compared with the vortex of the s-wave SC in the clean system. We also confirm this enhancement through quantitative comparison with results based on the BdG theory. We also study effects of Born-type impurities using self-energy formalism and find that the larger charge density is rather suppressed in contrast to the s-wave's one. Furthermore we study the local density of states as another equilibrium property of particle-hole asymmetry.

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