Tao, Ran, Yan, Ya-Jun, Liu, Xi, Wang, Zhi-Wei, Ando, Yoichi ORCID: 0000-0002-3553-3355, Wang, Qiang-Hua, Zhang, Tong and Feng, Dong-Lai (2018). Direct Visualization of the Nematic Superconductivity in CuxBi2Se3. Phys. Rev. X, 8 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2160-3308

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Abstract

CuxBi2Se3 hosts both topological surface states and bulk superconductivity. It has been identified recently as a topological superconductor (TSC) with an extraordinary nematic, i.e., C-2-symmetric superconducting state and odd-parity pairing. Here, using scanning tunneling microscopy, we directly examine the response of the superconductivity of CuxBi2Se3 to magnetic field. Under out-of-plane fields (B-perpendicular to), we discover elongated magnetic vortices hosting zero-bias conductance peaks consistent with the Majorana bound states expected in a TSC. Under in-plane fields (B-//), the average superconducting gap exhibits twofold symmetry with field orientation; the long C-2 symmetry axes are pinned to the dihedral mirror planes under B-// = 0.5 T but rotate slightly under B-// = 1.0 T. Moreover, a nodeless Delta(4x) gap structure is semiquantitatively determined for the first time. Our data paint a microscopic picture of the nematic superconductivity in CuxBi2Se3 and pose strong constraints on theory.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Tao, RanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yan, Ya-JunUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Liu, XiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, Zhi-WeiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ando, YoichiUNSPECIFIEDorcid.org/0000-0002-3553-3355UNSPECIFIED
Wang, Qiang-HuaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zhang, TongUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Feng, Dong-LaiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-165804
DOI: 10.1103/PhysRevX.8.041024
Journal or Publication Title: Phys. Rev. X
Volume: 8
Number: 4
Date: 2018
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2160-3308
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
Physics, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/16580

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