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

被引:72
作者
Estrecho, E. [1 ,2 ]
Gao, T. [3 ]
Bobrovska, N. [4 ]
Comber-Todd, D. [1 ,2 ]
Fraser, M. D. [5 ,6 ]
Steger, M. [7 ]
West, K. [8 ]
Pfeiffer, L. N. [9 ]
Levinsen, J. [10 ,11 ]
Parish, M. M. [10 ,11 ]
Liew, T. C. H. [12 ]
Matuszewski, M. [4 ]
Snoke, D. W. [13 ]
Truscott, A. G. [14 ]
Ostrovskaya, E. A. [1 ,2 ]
机构
[1] Australian Natl Univ, Res Sch Phys & Engn, Arc Ctr Excellence Future Low Energy Elect Techno, Canberra, ACT 2601, Australia
[2] Australian Natl Univ, Res Sch Phys & Engn, Nonlinear Phys Ctr, Canberra, ACT 2601, Australia
[3] Tianjin Univ, Inst Mol Plus, Tianjin 300072, Peoples R China
[4] Polish Acad Sci, Inst Phys, A Lotinikow 32-46, PL-02668 Warsaw, Poland
[5] PRESTO, JST, 4-1-8 Honcho, Kawaguchi, Saitama 3320012, Japan
[6] RIKEN, Ctr Emergent Matter Sci, Quantum Funct Syst Res Grp, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
[7] Natl Renewable Energy Lab, Golden, CO 80401 USA
[8] Princeton Univ, Princeton Inst Sci & Technol Mat PRISM, Princeton, NJ 08544 USA
[9] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA
[10] Monash Univ, Arc Ctr Excellence Future Low Energy Elect Techno, Melbourne, Vic 3800, Australia
[11] Monash Univ, Sch Phys & Astron, Melbourne, Vic 3800, Australia
[12] Nanyang Technol Univ, Div Phys & Appl Phys, Singapore, Singapore
[13] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA
[14] Australian Natl Univ, Res Sch Phys & Engn, Laser Phys Ctr, Canberra, ACT 2601, Australia
基金
美国国家科学基金会; 澳大利亚研究理事会; 日本学术振兴会; 日本科学技术振兴机构;
关键词
BOSE-EINSTEIN CONDENSATION; SEMICONDUCTOR MICROCAVITY; DYNAMICS; SCATTERING; EMISSION;
D O I
10.1103/PhysRevB.100.035306
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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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页数:10
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