Year: 2020
Type: article
Abstract: He, is closely related to Bose-Einstein condensation (BEC) phenomenon. However, even at zero temperature, a fraction of the quantum liquid is excited out of the condensate into higher momentum states via interaction-induced fluctuations-the phenomenon of quantum depletion. Quantum depletion of atomic BECs in thermal equilibrium is well understood theoretically but is difficult to measure. This measurement is even more challenging in driven-dissipative exciton-polariton condensates, since their non-equilibrium nature is predicted to suppress quantum depletion. Here, we observe quantum depletion of a high-density exciton-polariton condensate by detecting the spectral branch of elementary excitations populated by this process. Analysis of this excitation branch shows that quantum depletion of exciton-polariton condensates can closely follow or strongly deviate from the equilibrium Bogoliubov theory, depending on the exciton fraction in an exciton polariton. Our results reveal beyond mean-field effects of exciton-polariton interactions and call for a deeper understanding of the relationship between equilibrium and non-equilibrium BECs.
Source: Nature Communications
Authors: Maciej Pieczarka, Eliezer Estrecho, Maryam Boozarjmehr, Olivier Bleu, Mark Steger, Kenneth West, Loren N. Pfeiffer, David W. Snoke, Jesper Levinsen, Meera M. Parish, Andrew G. Truscott, Elena A. Ostrovskaya
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,380
Awards: G1055875721, Loren Pfeiffer and Mansour Shayegan Materials Synthesis Investigator Awards, G2871559812, Princeton Center for Complex Materials, Few-body correlations in many-particle quantum matter, G5341564354, G5385673730, G6027800462, ARC Centre of Excellence in Future Low Energy Electronics Technologies, G7452299184, G8257659198
OpenAlex ID: W3002767555