Phase Transitions of the Polariton Condensate in 2D Dirac Materials

Ki Hoon Lee, Changhee Lee, Hongki Min, and Suk Bum Chung
Phys. Rev. Lett. 120, 157601 – Published 9 April 2018
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Abstract

For the quantum well in an optical microcavity, the interplay of the Coulomb interaction and the electron-photon (e-ph) coupling can lead to the hybridizations of the exciton and the cavity photon known as polaritons, which can form the Bose-Einstein condensate above a threshold density. Additional physics due to the nontrivial Berry phase comes into play when the quantum well consists of the gapped two-dimensional Dirac material such as the transition metal dichalcogenide MoS2 or WSe2. Specifically, in forming the polariton, the e-ph coupling from the optical selection rule due to the Berry phase can compete against the Coulomb electron-electron (ee) interaction. We find that this competition gives rise to a rich phase diagram for the polariton condensate involving both topological and symmetry breaking phase transitions, with the former giving rise to the quantum anomalous Hall and the quantum spin Hall phases.

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  • Received 1 October 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.157601

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Ki Hoon Lee1,2, Changhee Lee2, Hongki Min2,*, and Suk Bum Chung1,2,3,†

  • 1Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul National University, Seoul 08826, Korea
  • 2Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
  • 3Department of Physics, University of Seoul, Seoul 02504, Korea

  • *hmin@snu.ac.kr
  • sbchung0@uos.ac.kr

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Issue

Vol. 120, Iss. 15 — 13 April 2018

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