Observation of topological transition in high-Tc superconducting monolayer FeTe1-x Sex films on SrTiO3(001)

X. L. Peng, Y. Li, X. X. Wu, H. B. Deng, X. Shi, W. H. Fan, M. Li, Y. B. Huang, T. Qian, P. Richard, J. P. Hu, S. H. Pan, H. Q. Mao, Y. J. Sun, H. Ding

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

Superconductors with topological surface or edge states have been intensively explored for the prospect of realizing Majorana bound states, which obey non-Abelian statistics and are crucial for topological quantum computation. The traditional routes for making topological insulator/superconductor and semiconductor/superconductor heterostructures suffer fabrication difficulties and can only work at low temperature. Here, we use angle-resolved photoemission spectroscopy to directly observe the evolution of a topological transition of band structure nearby the Fermi level in two-dimensional high-Tc superconductor FeTe1-xSex/SrTiO3(001) monolayers, fully consistent with our theoretical calculations. Furthermore, evidence of edge states is revealed by scanning tunneling spectroscopy with assistance of theoretical calculations. Our study provides a simple and tunable platform for realizing and manipulating Majorana states at high temperature.

Original languageEnglish
Article number155134
JournalPhysical Review B
Volume100
Issue number15
DOIs
Publication statusPublished - 21 Oct 2019
Externally publishedYes

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