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Title: Unconventional transformation of spin Dirac phase across a topological quantum phase transition

The topology of a topological material can be encoded in its surface states. These surface states can only be removed by a bulk topological quantum phase transition into a trivial phase. Here we use photoemission spectroscopy to image the formation of protected surface states in a topological insulator as we chemically tune the system through a topological transition. Surprisingly, we discover an exotic spin-momentum locked, gapped surface state in the trivial phase that shares many important properties with the actual topological surface state in anticipation of the change of topology. Using a spin-resolved measurement, we show that apart from a surface bandgap these states develop spin textures similar to the topological surface states well before the transition. Our results provide a general paradigm for understanding how surface states in topological phases arise from a quantum phase transition and are suggestive for the future realization of Weyl arcs, condensed matter supersymmetry and other fascinating phenomena in the vicinity of a quantum criticality.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [4] ; ORCiD logo [1] ;  [5] ;  [6] ;  [7] ;  [1] ;  [8] ;  [5] ;  [1]
  1. Princeton Univ., Princeton, NJ (United States)
  2. Princeton Univ., Princeton, NJ (United States); Peking Univ., Beijing (China)
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  4. Paul Scherrer Inst. (PSI), Villigen (Switzerland); Ecole Polytechnique Fedeerale de Lausanne, Lausanne (Switzerland)
  5. Northeastern Univ., Boston, MA (United States)
  6. National Tsing Hua Univ., Hsinchu (Taiwan)
  7. National Tsing Hua Univ., Hsinchu (Taiwan); Academia Sinica, Taipei (Taiwan)
  8. National Univ. of Singapore (Singapore)
Publication Date:
Grant/Contract Number:
FG02-07ER46352; AC03-76SF00098; AC03-76SF00515; FG02-05ER46200
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; physical sciences; applied physics; condensed matter
OSTI Identifier:
1224062

Xu, Su -Yang, Neupane, Madhab, Belopolski, Ilya, Liu, Chang, Alidoust, Nasser, Bian, Guang, Jia, Shuang, Landolt, Gabriel, Slomski, Batosz, Dil, J. Hugo, Shibayev, Pavel P., Basak, Susmita, Chang, Tay -Rong, Jeng, Horng -Tay, Cava, Robert J., Lin, Hsin, Bansil, Arun, and Hasan, M. Zahid. Unconventional transformation of spin Dirac phase across a topological quantum phase transition. United States: N. p., Web. doi:10.1038/ncomms7870.
Xu, Su -Yang, Neupane, Madhab, Belopolski, Ilya, Liu, Chang, Alidoust, Nasser, Bian, Guang, Jia, Shuang, Landolt, Gabriel, Slomski, Batosz, Dil, J. Hugo, Shibayev, Pavel P., Basak, Susmita, Chang, Tay -Rong, Jeng, Horng -Tay, Cava, Robert J., Lin, Hsin, Bansil, Arun, & Hasan, M. Zahid. Unconventional transformation of spin Dirac phase across a topological quantum phase transition. United States. doi:10.1038/ncomms7870.
Xu, Su -Yang, Neupane, Madhab, Belopolski, Ilya, Liu, Chang, Alidoust, Nasser, Bian, Guang, Jia, Shuang, Landolt, Gabriel, Slomski, Batosz, Dil, J. Hugo, Shibayev, Pavel P., Basak, Susmita, Chang, Tay -Rong, Jeng, Horng -Tay, Cava, Robert J., Lin, Hsin, Bansil, Arun, and Hasan, M. Zahid. 2015. "Unconventional transformation of spin Dirac phase across a topological quantum phase transition". United States. doi:10.1038/ncomms7870. https://www.osti.gov/servlets/purl/1224062.
@article{osti_1224062,
title = {Unconventional transformation of spin Dirac phase across a topological quantum phase transition},
author = {Xu, Su -Yang and Neupane, Madhab and Belopolski, Ilya and Liu, Chang and Alidoust, Nasser and Bian, Guang and Jia, Shuang and Landolt, Gabriel and Slomski, Batosz and Dil, J. Hugo and Shibayev, Pavel P. and Basak, Susmita and Chang, Tay -Rong and Jeng, Horng -Tay and Cava, Robert J. and Lin, Hsin and Bansil, Arun and Hasan, M. Zahid},
abstractNote = {The topology of a topological material can be encoded in its surface states. These surface states can only be removed by a bulk topological quantum phase transition into a trivial phase. Here we use photoemission spectroscopy to image the formation of protected surface states in a topological insulator as we chemically tune the system through a topological transition. Surprisingly, we discover an exotic spin-momentum locked, gapped surface state in the trivial phase that shares many important properties with the actual topological surface state in anticipation of the change of topology. Using a spin-resolved measurement, we show that apart from a surface bandgap these states develop spin textures similar to the topological surface states well before the transition. Our results provide a general paradigm for understanding how surface states in topological phases arise from a quantum phase transition and are suggestive for the future realization of Weyl arcs, condensed matter supersymmetry and other fascinating phenomena in the vicinity of a quantum criticality.},
doi = {10.1038/ncomms7870},
journal = {Nature Communications},
number = ,
volume = 6,
place = {United States},
year = {2015},
month = {4}
}