Phase Transitions of the Polariton Condensate in 2D Dirac Materials

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Title
Phase Transitions of the Polariton Condensate in 2D Dirac Materials
Author(s)
Ki Hoon Lee; Changhee Lee; Hongki Min; Suk Bum Chung
Publication Date
2018-04
Journal
PHYSICAL REVIEW LETTERS, v.120, no.15, pp.157601 -
Publisher
AMER PHYSICAL SOC
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 (e-e) 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 © 2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/4570
ISSN
0031-9007
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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