Shubnikov–de Haas oscillations as a probe for topological insulators

POSTER

Abstract

In this work we study the bulk Shubnikov–de Haas oscillations (SdH) of 2D topological insulators. Our approach uses the complete 4x4 BHZ model [1] and a phenomenological trace formula [2] for the density of states accounting for Landau-level quantization. Within the topological regime, our results show unusual beatings of the SdH oscillations for a wide range of parameters. These unusual beatings are related to the coexistence of both electron- and hole-like carriers, present in the “Mexican hat” regime. This suggests ordinary SdH oscillations as a probe for bulk 2D systems with non-trivial band topology.

[1] B. Andrei Bernevig, Taylor L. Hughes, Shou-Cheng Zhang, Science 314, 1757 (2006).
[2] Brack, M., and R. K. Bhaduri, 1997, Semiclassical Physics (Addison-Wesley, Reading, MA)

*This work was supported by the Reykjavik University Research Fund, CNPq Grant No. 306122/2018-9,CAPES, FAPESP Grants No. 2016/08468-0 and No. 2020/00841-9.

Presenters

  • Denis R Candido

    • Department of Physics and Astronomy, University of Iowa
    • University of Iowa
    • Univ of Iowa

Authors

  • Joo Vitor Ignácio Costa

    • Instituto de Física de São Carlos, Universidade de São Paulo

  • Denis R Candido

    • Department of Physics and Astronomy, University of Iowa
    • University of Iowa
    • Univ of Iowa

  • Sigurdur I. Erlingsson

    • School of Science and Engineering, Reykjavik University

  • Carlos Egues

    • Instituto de Física de São Carlos, Universidade de São Paulo
    • University of Sao Paulo, Sao Carlos
    • Instituto de Física de São Carlos
    • Institute of Physics of São Carlos, University of São Paulo