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Symmetry conditions of a nodal superconductor for generating robust flat-band Andreev bound states at its dirty surface
| Title: | Symmetry conditions of a nodal superconductor for generating robust flat-band Andreev bound states at its dirty surface |
| Authors: | Ikegaya, Satoshi Browse this author | | Kobayashi, Shingo Browse this author | | Asano, Yasuhiro Browse this author →KAKEN DB |
| Issue Date: | 1-May-2018 |
| Publisher: | American Physical Society (APS) |
| Journal Title: | Physical Review B |
| Volume: | 97 |
| Issue: | 17 |
| Start Page: | 174501 |
| Publisher DOI: | 10.1103/PhysRevB.97.174501 |
| Abstract: | We discuss the symmetry property of a nodal superconductor that hosts robust flat-band zero-energy states at its surface under potential disorder. Such robust zero-energy states are known to induce the anomalous proximity effect in a dirty normal metal attached to a superconductor. A recent study has shown that a topological index N-ZES describes the number of zero-energy states at the dirty surface of a p-wave superconductor. We generalize the theory to clarify the conditions required for a superconductor that enables N-ZES not equal 0. Our results show that N-ZES not equal 0 is realized in a topological material that belongs to either the BDI or CII class. We also present two realistic Hamiltonians that result in N-ZES not equal 0. |
| Rights: | ©2018 American Physical Society |
| Type: | article |
| URI: | http://hdl.handle.net/2115/70797 |
| 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)
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Submitter: 浅野 泰寛
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