Multiple In-Gap States Induced by Topological Surface States in the Superconducting Topological Crystalline Insulator Heterostructure Sn 1 − x Pb x Te − Pb
Name
PhysRevLett.125.136802.pdf
Description
Published version
Size
749.44 KB
Format
Adobe PDF
Checksum (MD5)
1c3436a92eccf2517879ffc2dadc2005
Author(s)
Yang, Hao
Li, Yao-Yi
Liu, Teng-Teng
Guan, Dan-Dan
Wang, Shi-Yong
Zheng, Hao
Liu, Canhua
Fu, Liang
Jia, Jin-Feng
Date Issued
2020
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2020 American Physical Society. Superconducting topological crystalline insulators (TCIs) have been proposed to be a new type of topological superconductor where multiple Majorana zero modes may coexist under the protection of lattice symmetries. The bulk superconductivity of TCIs has been realized, but it is quite challenging to detect the superconductivity of topological surface states inside their bulk superconducting gaps. Here, we report high-resolution scanning tunneling spectroscopy measurements on lateral Sn1-xPbxTe-Pb heterostructures using superconducting tips. Both the bulk superconducting gap and the multiple in-gap states with energy differences of ∼0.3 meV can be clearly resolved on TCI Sn1-xPbxTe at 0.38 K. Quasiparticle interference measurements further confirm the in-gap states are gapless. Our work demonstrates that the unique topological superconductivity of a TCI can be directly distinguished in the density of states, which helps to further investigate the multiple Dirac and Majorana fermions inside the superconducting gap.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.125.136802
