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Title: Topological phase diagram and saddle point singularity in a tunable topological crystalline insulator

Here we report the evolution of the surface electronic structure and surface material properties of a topological crystalline insulator (TCI), Pb1$${-}$$xSnxSe, as a function of various material parameters including composition x, temperature T , and crystal structure. Our spectroscopic data demonstrate the electronic ground-state condition for the saddle point singularity, the tunability of surface chemical potential, and the surface states’ response to circularly polarized light. Our results show that each material parameter can tune the system between the trivial and topological phase in a distinct way, unlike that seen in Bi2Se3 and related compounds, leading to a rich topological phase diagram. Our systematic studies of the TCI Pb1$${-}$$xSnxSe are a valuable materials guide to realize new topological phenomena.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [4] ;  [8] ;  [3] ;  [12]
  1. Princeton Univ., NJ (United States). Joseph Henry Lab., Dept. of Physics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Princeton Univ., NJ (United States). Joseph Henry Lab., Dept. of Physics
  3. National Taiwan Univ., Taipei (Taiwan). Center for Condensed Matter Sciences
  4. Princeton Univ., NJ (United States). Dept. of Chemistry
  5. Northeastern Univ., Boston, MA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  6. Synchrotron SOLEIL, Saint-Aubin (France)
  7. Synchrotron SOLEIL, Saint-Aubin (France). UR1/CNRS
  8. Northeastern Univ., Boston, MA (United States). Dept. of Physics
  9. National Sun Yat-sen Univ., Kaohsiung (Taiwan). Dept. of Physics
  10. National Univ. of Singapore (Singapore). Centre for Advanced 2D Materials and Graphene Research Centre; National Univ. of Singapore (Singapore). Dept. of Physics
  11. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  12. Princeton Univ., NJ (United States). Princeton Center for Complex Materials
Publication Date:
OSTI Identifier:
1334116
Report Number(s):
LA-UR--15-26948
Journal ID: ISSN 1098-0121; PRBMDO
Grant/Contract Number:
AC52-06NA25396; FG- 02-40105ER46200; GBMF4547; FG02-07ER46352; AC02-05CH11231; NRF-NRFF2013-03
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 7; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); NSF; Gordon and Betty Moore Foundation; Singapore National Research Foundation
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE Topological Insulator; ARPES