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
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: |
|
||||||||||||||||||||||||||||||||||||
| 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: | Faculty of Mathematics and Natural Sciences | ||||||||||||||||||||||||||||||||||||
| Divisions: | Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II | ||||||||||||||||||||||||||||||||||||
| Subjects: | no entry | ||||||||||||||||||||||||||||||||||||
| Uncontrolled Keywords: |
|
||||||||||||||||||||||||||||||||||||
| Refereed: | Yes | ||||||||||||||||||||||||||||||||||||
| URI: | http://kups.ub.uni-koeln.de/id/eprint/16580 |
Downloads
Downloads per month over past year
Altmetric
Export
Actions (login required)
 |
View Item |