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

E. Estrecho, T. Gao, N. Bobrovska, D. Comber-Todd, M. D. Fraser, M. Steger, K. West, L. N. Pfeiffer, J. Levinsen, M. M. Parish, T. C.H. Liew, M. Matuszewski, D. W. Snoke, A. G. Truscott, E. A. Ostrovskaya

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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.

Original languageEnglish
Article number035306
Number of pages10
JournalPhysical Review B
Volume100
Issue number3
DOIs
Publication statusPublished - 15 Jul 2019

Cite this

Estrecho, E., Gao, T., Bobrovska, N., Comber-Todd, D., Fraser, M. D., Steger, M., ... Ostrovskaya, E. A. (2019). Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation. Physical Review B, 100(3), [035306]. https://doi.org/10.1103/PhysRevB.100.035306
Estrecho, E. ; Gao, T. ; Bobrovska, N. ; Comber-Todd, D. ; Fraser, M. D. ; Steger, M. ; 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. In: Physical Review B. 2019 ; Vol. 100, No. 3.
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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.",
author = "E. Estrecho and T. Gao and N. Bobrovska and D. Comber-Todd and Fraser, {M. D.} and M. Steger and K. West and Pfeiffer, {L. N.} and J. Levinsen and Parish, {M. M.} and Liew, {T. C.H.} and M. Matuszewski and Snoke, {D. W.} and Truscott, {A. G.} and Ostrovskaya, {E. A.}",
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Estrecho, E, Gao, T, Bobrovska, N, Comber-Todd, D, Fraser, MD, Steger, M, West, K, Pfeiffer, LN, Levinsen, J, Parish, MM, Liew, TCH, Matuszewski, M, Snoke, DW, Truscott, AG & Ostrovskaya, EA 2019, 'Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation', Physical Review B, vol. 100, no. 3, 035306. https://doi.org/10.1103/PhysRevB.100.035306

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, M.; 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.

In: Physical Review B, Vol. 100, No. 3, 035306, 15.07.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation

AU - Estrecho, E.

AU - Gao, T.

AU - Bobrovska, N.

AU - Comber-Todd, D.

AU - Fraser, M. D.

AU - Steger, M.

AU - West, K.

AU - Pfeiffer, L. N.

AU - Levinsen, J.

AU - Parish, M. M.

AU - Liew, T. C.H.

AU - Matuszewski, M.

AU - Snoke, D. W.

AU - Truscott, A. G.

AU - Ostrovskaya, E. A.

PY - 2019/7/15

Y1 - 2019/7/15

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevB.100.035306

DO - 10.1103/PhysRevB.100.035306

M3 - Article

VL - 100

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 3

M1 - 035306

ER -