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

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.

doi:10.1103/PhysRevB.100.035306

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

Journal Article · Mon Jul 15 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.100.035306· OSTI ID:1557406

Estrecho, E. ^[1]; Gao, T. ^[2]; Bobrovska, N. ^[3]; Comber-Todd, D. ^[1]; Fraser, M. D. ^[4]; Steger, Mark ^[5]; West, K. ^[6]; Pfeiffer, L. N. ^[6]; Levinsen, J. ^[7]; Parish, M. M. ^[7]; Liew, T. C. H. ^[8]; Matuszewski, M. ^[9]; Snoke, D. W. ^[10]; Truscott, A. G. ^[1]; Ostrovskaya, E. A. ^[1]

Australian National Univ., Canberra, ACT (Australia)
Tianjin Univ. (China)
Polish Academy of Sciences (PAS), Warsaw (Poland).
Japan Science and Technology Agency (JST), Saitama (Japan); RIKEN Center for Emergent Matter Science, Saitama (Japan)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Princeton Univ., NJ (United States)
Monash Univ., Melbourne, VIC (Australia)
Nanyang Technological Univ. (Singapore)
Polish Academy of Sciences (PAS), Warsaw (Poland)
Univ. of Pittsburgh, PA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1557406

Report Number(s):: NREL/JA--5K00-74563

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 3 Vol. 100; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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

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