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Stability of flat zero-energy states at the dirty surface of a nodal superconductor

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Title: Stability of flat zero-energy states at the dirty surface of a nodal superconductor
Authors: Ikegaya, Satoshi Browse this author
Asano, Yasuhiro Browse this author →KAKEN DB
Issue Date: 5-Jun-2017
Publisher: American Physical Society (APS)
Journal Title: Physical Review B
Volume: 95
Issue: 21
Start Page: 214503-1
End Page: 214503-11
Publisher DOI: 10.1103/PhysRevB.95.214503
Abstract: We discuss the stability of highly degenerate zero-energy states that appear at the surface of a nodal superconductor preserving time-reversal symmetry. The existence of such surface states is a direct consequence of the nontrivial topological numbers defined in the restricted Brillouin zones in the clean limit. In experiments, however, potential disorder is inevitable near the surface of a real superconductor, which may lift the high degeneracy at zero energy. We show that an index defined in terms of the chiral eigenvalues of the zero-energy states can be used to measure the degree of degeneracy at zero energy in the presence of potential disorder. We also discuss the relationship between the index and the topological numbers.
Rights: ©2017 American Physical Society
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 浅野 泰寛

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