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Title: Elemental Topological Dirac Semimetal: α -Sn on InSb(111)

Three-dimensional (3D) topological Dirac semimetals (TDSs) are rare but important as a versatile platform for exploring exotic electronic properties and topological phase transitions. A quintessential feature of TDSs is 3D Dirac fermions associated with bulk electronic states near the Fermi level. We have observed such bulk Dirac cones in epitaxially grown α-Sn films on InSb(111), the first such TDS system realized in an elemental form, using angle-resolved photoemission spectroscopy. First-principles calculations confirm that epitaxial strain is key to the formation of the TDS phase. A phase diagram is established that connects the 3D TDS phase through a singular point of a zero-gap semimetal phase to a topological insulator phase. The nature of the Dirac cone crosses over from 3D to 2D as the film thickness is reduced.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [5] ;  [6] ;  [6] ;  [7] ;  [3] ;  [7] ;  [8] ;  [7] ;  [7] ;  [9]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics, Frederick Seitz Materials Research Lab.; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  2. Inst. of Atomic and Molecular Sciences, Taipei (Taiwan)
  3. Univ. of Toronto, ON (Canada). Dept. of Physics
  4. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics, Frederick Seitz Materials Research Lab.; Univ. of Science and Technology, Nanjing (China). College of Science
  5. European Synchrotron Radiation Facility (ESRF), Grenoble (France). Structure of Materials Group
  6. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics, Frederick Seitz Materials Research Lab.
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  8. Inst. of Atomic and Molecular Sciences, Taipei (Taiwan); Georgia Inst. of Technology, Atlanta, GA (United States). School of Physics; National Taiwan Univ., Taipei (Taiwan). Dept. of Physics
  9. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics, Frederick Seitz Materials Research Lab.; National Taiwan Univ., Taipei (Taiwan). Dept. of Physics
Publication Date:
Grant/Contract Number:
AC02-05CH11231; FG02-97ER45632; FG02-07ER46383
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 14; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1379797
Alternate Identifier(s):
OSTI ID: 1349973