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Title: Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation

Abstract

Bosonic condensates of exciton polaritons (light-matter quasiparticles in a semiconductor) provide a solid-state platform for studies of nonequilibrium quantum systems with a spontaneous macroscopic coherence. These driven, dissipative condensates typically coexist and interact with an incoherent reservoir, which undermines measurements of key parameters of the condensate. Here, we overcome this limitation by creating a high-density exciton-polariton condensate in an optically induced box trap. In this so-called Thomas-Fermi regime, the condensate is fully separated from the reservoir and its behavior is dominated by interparticle interactions. We use this regime to directly measure the polariton-polariton interaction strength, and reduce the existing uncertainty in its value from four orders of magnitude to within three times the theoretical prediction. The Thomas-Fermi regime has previously been demonstrated only in ultracold atomic gases in thermal equilibrium. In a nonequilibrium exciton-polariton system, this regime offers a novel opportunity to study interaction-driven effects unmasked by an incoherent reservoir.

Authors:
 [1];  [2];  [3];  [1];  [4];  [5];  [6];  [6];  [7];  [7];  [8];  [9];  [10];  [1];  [1]
  1. Australian National Univ., Canberra, ACT (Australia)
  2. Tianjin Univ. (China)
  3. Polish Academy of Sciences (PAS), Warsaw (Poland).
  4. Japan Science and Technology Agency (JST), Saitama (Japan); RIKEN Center for Emergent Matter Science, Saitama (Japan)
  5. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  6. Princeton Univ., NJ (United States)
  7. Monash Univ., Melbourne, VIC (Australia)
  8. Nanyang Technological Univ. (Singapore)
  9. Polish Academy of Sciences (PAS), Warsaw (Poland)
  10. Univ. of Pittsburgh, PA (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1557406
Report Number(s):
NREL/JA-5K00-74563
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 3; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Bose-Einstein condensates; exciton polariton; polaritons; quasiparticles; collective excitations

Citation Formats

Estrecho, E., Gao, T., Bobrovska, N., Comber-Todd, D., Fraser, M. D., Steger, Mark, West, K., Pfeiffer, L. N., Levinsen, J., Parish, M. M., Liew, T. C. H., Matuszewski, M., Snoke, D. W., Truscott, A. G., and Ostrovskaya, E. A. Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.035306.
Estrecho, E., Gao, T., Bobrovska, N., Comber-Todd, D., Fraser, M. D., Steger, Mark, West, K., Pfeiffer, L. N., Levinsen, J., Parish, M. M., Liew, T. C. H., Matuszewski, M., Snoke, D. W., Truscott, A. G., & Ostrovskaya, E. A. Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation. United States. doi:10.1103/PhysRevB.100.035306.
Estrecho, E., Gao, T., Bobrovska, N., Comber-Todd, D., Fraser, M. D., Steger, Mark, West, K., Pfeiffer, L. N., Levinsen, J., Parish, M. M., Liew, T. C. H., Matuszewski, M., Snoke, D. W., Truscott, A. G., and Ostrovskaya, E. A. Mon . "Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation". United States. doi:10.1103/PhysRevB.100.035306.
@article{osti_1557406,
title = {Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation},
author = {Estrecho, E. and Gao, T. and Bobrovska, N. and Comber-Todd, D. and Fraser, M. D. and Steger, Mark and West, K. and Pfeiffer, L. N. and Levinsen, J. and Parish, M. M. and Liew, T. C. H. and Matuszewski, M. and Snoke, D. W. and Truscott, A. G. and Ostrovskaya, E. A.},
abstractNote = {Bosonic condensates of exciton polaritons (light-matter quasiparticles in a semiconductor) provide a solid-state platform for studies of nonequilibrium quantum systems with a spontaneous macroscopic coherence. These driven, dissipative condensates typically coexist and interact with an incoherent reservoir, which undermines measurements of key parameters of the condensate. Here, we overcome this limitation by creating a high-density exciton-polariton condensate in an optically induced box trap. In this so-called Thomas-Fermi regime, the condensate is fully separated from the reservoir and its behavior is dominated by interparticle interactions. We use this regime to directly measure the polariton-polariton interaction strength, and reduce the existing uncertainty in its value from four orders of magnitude to within three times the theoretical prediction. The Thomas-Fermi regime has previously been demonstrated only in ultracold atomic gases in thermal equilibrium. In a nonequilibrium exciton-polariton system, this regime offers a novel opportunity to study interaction-driven effects unmasked by an incoherent reservoir.},
doi = {10.1103/PhysRevB.100.035306},
journal = {Physical Review B},
number = 3,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}

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