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'pi-state' induced by impurities with a repulsive interaction

机译:具有排斥相互作用的杂质引起的“π-态”

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摘要

We study the properties of a quantum impurity embedded in a superconducting host. The superconductor is described by the negative U Hubbard model while the impurity introduces a repulsive interaction to the system. We discuss the influence of this 'on-impurity' Coulomb repulsion on the local properties, (density of states, electron pairing) of the superconductor. We show the condition of pi-like behaviour. defined as two subsystems having a phase difference of pi, in the system by using a proper combination of attractive pairing interaction and repulsive one located at impurity site.
机译:我们研究了嵌入超导主体中的量子杂质的性质。超导体由负U Hubbard模型描述,而杂质将排斥相互作用引入系统。我们讨论了这种“杂质”库仑斥力对超导体的局部特性(状态密度,电子对)的影响。我们展示了类似pi行为的情况。在系统中,通过使用吸引性配对相互作用和位于杂质位点的排斥对相互作用的适当组合,定义为具有π相位差的两个子系统。

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