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

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 re...

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Main Authors: 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, Timothy Chi Hin, Matuszewski, M., Snoke, D. W., Truscott, A. G., Ostrovskaya, E. A.
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/142492
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spelling sg-ntu-dr.10356-1424922023-02-28T19:47:48Z 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, Timothy Chi Hin Matuszewski, M. Snoke, D. W. Truscott, A. G. Ostrovskaya, E. A. School of Physical and Mathematical Sciences Science::Physics Bose-Einstein Condensates Exciton Polariton 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. MOE (Min. of Education, S’pore) Published version 2020-06-23T02:01:20Z 2020-06-23T02:01:20Z 2019 Journal Article 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-. doi:10.1103/PhysRevB.100.035306 2469-9950 https://hdl.handle.net/10356/142492 10.1103/PhysRevB.100.035306 2-s2.0-85070696343 3 100 en Physical Review B © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics
Bose-Einstein Condensates
Exciton Polariton
spellingShingle Science::Physics
Bose-Einstein Condensates
Exciton Polariton
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, Timothy Chi Hin
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
description 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.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
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, Timothy Chi Hin
Matuszewski, M.
Snoke, D. W.
Truscott, A. G.
Ostrovskaya, E. A.
format Article
author 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, Timothy Chi Hin
Matuszewski, M.
Snoke, D. W.
Truscott, A. G.
Ostrovskaya, E. A.
author_sort Estrecho, E.
title Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation
title_short Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation
title_full Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation
title_fullStr Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation
title_full_unstemmed Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation
title_sort direct measurement of polariton-polariton interaction strength in the thomas-fermi regime of exciton-polariton condensation
publishDate 2020
url https://hdl.handle.net/10356/142492
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