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

Neupane, Madhab; Xu, Su-Yang; Sankar, R.; Gibson, Q.; Wang, Y. J.; Belopolski, I.; Alidoust, N.; Bian, G.; Shibayev, P. P.; Sanchez, D. S.; Ohtsubo, Y.; Taleb-Ibrahimi, A.; Basak, S.; Tsai, W. -F.; Lin, H.; Durakiewicz, Tomasz; Cava, R. J.; Bansil, A.; Chou, F. C.; Hasan, M. Z.

doi:10.1103/PhysRevB.92.075131

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

Journal Article · Thu Aug 20 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.075131· OSTI ID:1334116

Neupane, Madhab ^[1]; Xu, Su-Yang ^[2]; Sankar, R. ^[3]; Gibson, Q. ^[4]; Wang, Y. J. ^[5]; Belopolski, I. ^[2]; Alidoust, N. ^[2]; Bian, G. ^[2]; Shibayev, P. P. ^[2]; Sanchez, D. S. ^[2]; Ohtsubo, Y. ^[6]; Taleb-Ibrahimi, A. ^[7]; Basak, S. ^[8]; Tsai, W. -F. ^[9]; Lin, H. ^[10]; Durakiewicz, Tomasz ^[11]; Cava, R. J. ^[4]; Bansil, A. ^[8]; Chou, F. C. ^[3]; Hasan, M. Z. ^[12]

Princeton Univ., NJ (United States). Joseph Henry Lab., Dept. of Physics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Princeton Univ., NJ (United States). Joseph Henry Lab., Dept. of Physics
National Taiwan Univ., Taipei (Taiwan). Center for Condensed Matter Sciences
Princeton Univ., NJ (United States). Dept. of Chemistry
Northeastern Univ., Boston, MA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Synchrotron SOLEIL, Saint-Aubin (France)
Synchrotron SOLEIL, Saint-Aubin (France). UR1/CNRS
Northeastern Univ., Boston, MA (United States). Dept. of Physics
National Sun Yat-sen Univ., Kaohsiung (Taiwan). Dept. of Physics
National Univ. of Singapore (Singapore). Centre for Advanced 2D Materials and Graphene Research Centre; National Univ. of Singapore (Singapore). Dept. of Physics
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Princeton Univ., NJ (United States). Princeton Center for Complex Materials

Here we report the evolution of the surface electronic structure and surface material properties of a topological crystalline insulator (TCI), Pb_1$${-}$$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 Pb_1$${-}$$xSnxSe are a valuable materials guide to realize new topological phenomena.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Gordon and Betty Moore Foundation; Singapore National Research Foundation

Grant/Contract Number:: AC52-06NA25396; FG- 02-40105ER46200; GBMF4547; FG02-07ER46352; AC02-05CH11231; NRF-NRFF2013-03; FG-02-40105ER46200

OSTI ID:: 1334116

Alternate ID(s):: OSTI ID: 1212322

Report Number(s):: LA-UR-15-26948; PRBMDO

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 7; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 23 works

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