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

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

doi:10.1038/ncomms7870

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

Journal Article · Fri Apr 17 00:00:00 EDT 2015 · Nature Communications

DOI:https://doi.org/10.1038/ncomms7870· OSTI ID:1224062

Xu, Su -Yang ^[1]; Neupane, Madhab ^[1]; Belopolski, Ilya ^[1]; Liu, Chang ^[1]; Alidoust, Nasser ^[1]; Bian, Guang ^[1]; Jia, Shuang ^[2]; Landolt, Gabriel ^[3]; Slomski, Batosz ^[3]; Dil, J. Hugo ^[4];

^[1]; Basak, Susmita ^[5]; Chang, Tay -Rong ^[6]; Jeng, Horng -Tay ^[7]; Cava, Robert J. ^[1]; Lin, Hsin ^[8]; Bansil, Arun ^[5]; Hasan, M. Zahid ^[1]

Princeton Univ., Princeton, NJ (United States)
Princeton Univ., Princeton, NJ (United States); Peking Univ., Beijing (China)
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Paul Scherrer Inst. (PSI), Villigen (Switzerland); Ecole Polytechnique Fedeerale de Lausanne, Lausanne (Switzerland)
Northeastern Univ., Boston, MA (United States)
National Tsing Hua Univ., Hsinchu (Taiwan)
National Tsing Hua Univ., Hsinchu (Taiwan); Academia Sinica, Taipei (Taiwan)
National Univ. of Singapore (Singapore)

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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-07ER46352; AC03-76SF00098; AC03-76SF00515; FG02-05ER46200

OSTI ID:: 1224062

Journal Information:: Nature Communications, Vol. 6; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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References (34)

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