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Title: Non-Hermitian Phase Transition from a Polariton Bose-Einstein Condensate to a Photon Laser

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [2]
  1. Univ. of Chicago, IL (United States). James Franck Inst. Dept. of Physics; Osaka Univ., Toyonaka (Japan). Dept. of Physics
  2. Univ. of Chicago, IL (United States). James Franck Inst. Dept. of Physics; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  3. Keio Univ., Yokohama (Japan). Dept. of Physics

We propose here a novel mechanism for a nonequilibrium phase transition in a $U(1)$-broken phase of an electron-hole-photon system, from a Bose-Einstein condensate of polaritons to a photon laser, induced by the non-Hermitian nature of the condensate. We show that a (uniform) steady state of the condensate can always be classified into two types, namely, arising either from lower or upper-branch polaritons. We prove (for a general model) and demonstrate (for a particular model of polaritons) that an exceptional point where the two types coalesce marks the end point of a first-order-like phase boundary between the two types, similar to a critical point in a liquid-gas phase transition. Since the phase transition found in this paper is not in general triggered by population inversion, our result implies that the second threshold observed in experiments is not necessarily a strong-to-weak-coupling transition, contrary to the widely believed understanding. Although our calculation mainly aims to clarify polariton physics, our discussion is applicable to general driven-dissipative condensates composed of two complex fields.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Osaka Univ., Toyonaka (Japan); Keio Univ., Yokohama (Japan)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Japan Society for the Promotion of Science (JSPS); Ministry of Education, Culture, Sports, Science and Technology (MEXT) (Japan)
Grant/Contract Number:
AC02-06CH11357; 17J01238; JP18K11345; JP18H05406; JP16K05503
OSTI ID:
1542179
Alternate ID(s):
OSTI ID: 1511515
Journal Information:
Physical Review Letters, Vol. 122, Issue 18; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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