Theory of “Emergence of excitonic superfluid at topological-insulator surfaces”

ORAL

Abstract

We study the BCS condensation of excitons on topological-insulator surfaces. With presence of a screened Coulomb interaction between excited electrons and holes, the BCS excitons can be formed with predicted transition temperature up to 40K. The thermal fluctuation is found to disturb the long-range order by creating vortex excitations. It lowers the mean-field estimation of the transition temperature and drives the transition into the Kosterlitz-Thouless type. The BCS condensation of excitons forms ground state with quantum coherence that leads to the experimentally observed long-range transport of photocurrent. We also discuss possible generation of the topological p+ip excitonic insulators at topological-insulator surfaces.

–

Presenters

  • Rui Wang

    Shanghai Jiao Tong University

Authors

  • Rui Wang

    Shanghai Jiao Tong University

  • Yasen Hou

    University of California, Davis, University of california, Davis

  • Rui Xiao

    University of California, Davis, University of california, Davis

  • Luke McClintock

    University of California, Davis, University of california, Davis

  • Henry Clark Travaglini

    University of California, Davis, University of california, Davis

  • John Paulus Francia

    University of California, Davis, University of california, Davis

  • Harry Fetsch

    Harvey Mudd College

  • Onur Erten

    Arizona State University, Rutgers University, New Brunswick, Department of Physics, Arizona State University

  • Sergey Savrasov

    Physics, UC Davis, University of California, Davis, University of california, Davis

  • Baigeng Wang

    Nanjing University

  • Antonio Rossi

    University of California, Davis, University of california, Davis

  • Inna Vishik

    University of California, Davis, University of california, Davis, Physics, University of California, Davis

  • Eli Rotenberg

    Advanced Light Source, E.O. Lawrence Berkeley National Lab, Berkeley, CA 94720, USA, Advanced Light Source, Lawrence Berkeley National Laboratory, ALS, Lawrence National Berkeley Laboratory, Advanced Light Source, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, USA, Advanced Light Source, E. O. Lawrence Berkeley National Laboratory

  • Dong Yu

    University of California, Davis, University of california, Davis