Exciton condensation in thin-film topological insulator

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We study the many-body physics in thin-film topological band insulator, where the inter-edge Coulomb interaction can lead to an exciton condensation transition. We investigate the universality class of the exciton condensation quantum critical point. With different chemical potentials and interactions, the exciton condensation can belong to z = 2 mean field, or 3d XY, or Yukawa-Higgs universality classes. The interplay between exciton condensate and the time-reversal symmetry breaking is also discussed. Predictions of our work can be tested experimentally by tuning the chemical potentials on both surfaces of the thin film through gate voltage. We also show that all the analysis of the exciton condensate can be directly applied to a spin-triplet superconductor phase with attractive inter-edge interaction.
Publisher
EPL ASSOCIATION
Issue Date
2012-03
Language
English
Article Type
Article
Keywords

SINGLE DIRAC CONE; GROSS-NEVEU MODEL; BI2TE3; BEHAVIOR; SURFACE

Citation

EPL, v.97, no.6

ISSN
0295-5075
DOI
10.1209/0295-5075/97/66008
URI
http://hdl.handle.net/10203/200027
Appears in Collection
PH-Journal Papers(저널논문)
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