Observation of an excitonic state in a topological insulator

ORAL

Abstract

The exciton, a bound state of an electron and a hole, is a fundamental quasiparticle induced by coherent light-matter interactions in semiconductors. Recent progress of topological phases of matter has shed light on new routes to inducing novel excitonic phases. We will report a direct observation of the excitonic state in a topological insulator measured by the ultrafast technique and also discuss the results in terms of correlations. Our work opens up a new platform for exploring exciton-mediated state in topological materials and their application.

*This work was primarily supported by the U.S. Department of En- ergy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05CH11231 (Ultrafast Materials Science Program KC2203).

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Presenters

  • Ryo Mori

    • Lawrence Berkeley National Lab
    • The University of Tokyo

Authors

  • Ryo Mori

    • Lawrence Berkeley National Lab
    • The University of Tokyo

  • Samuel T Ciocys

    • University of California, Berkeley

  • Kazuaki Takasan

    • The University of Tokyo
    • University of Tokyo

  • Ping Ai

    • Lawrence Berkeley National Laboratory

  • Kayla R Currier

    • Lawrence Berkeley National Laboratory

  • Takahiro Morimoto

    • The university of Tokyo
    • University of Tokyo
    • The University of Tokyo
    • Univ of Tokyo

  • Joel E Moore

    • Department of Physics, UC Berkeley and Materials Sciences Division, LBNL
    • University of California, Berkeley

  • Alessandra Lanzara

    • University of California, Berkeley