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- W3099382085 abstract "We study the quasiparticle spectrum of 2D topological $s$-wave superconductors with the Zeeman magnetic field and the Rashba spin-orbit coupling in the presence of spatial inhomogeneity. Solving the real-space Bogoliubov-de Gennes equations, we focus on the excitations within the superconducting gap amplitude, i.e., the appearance of mid-gap states. Two kinds of potential functions, line-type (a chain of impurities) and point-type (a single impurity) ones are examined to take spatial inhomogeneity into account. The line setting shows a link of the mid-gap states with the gapless surface modes indicated by the bulk-boundary correspondence in topological superfluid. The point one shows that the quasiparticles with mid-gap energy are much easily excited by an impurity when the Zeeman magnetic field increases within the topological number to be unchanged. Thus, we obtain insights into the robustness of a topological superconductor against non-magnetic impurities. Moreover, we derive an effective theory applicable to high magnetic fields. The effective gap is the mixture of the chiral $p$-wave and $s$-wave characters. The former is predominant when the magnetic field increases. Therefore, we claim that a chiral $p$-wave character of the effective gap function creates the mid-gap states." @default.
- W3099382085 created "2020-11-23" @default.
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- W3099382085 date "2015-03-15" @default.
- W3099382085 modified "2023-09-24" @default.
- W3099382085 title "Topological s-Wave Pairing Superconductivity with Spatial Inhomogeneity: Midgap-State Appearance and Robustness of Superconductivity" @default.
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- W3099382085 doi "https://doi.org/10.7566/jpsj.84.034711" @default.
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