Critical fluctuations in a confined driven-dissipative quantum condensate

Hassan Alnatah, Paolo Comaron, Shouvik Mukherjee, Jonathan Beaumariage, Loren N. Pfeiffer, Ken West, Kirk Baldwin, Marzena Szymańska, David W. Snoke

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Phase fluctuations determine the low-energy properties of quantum condensates. However, at the condensation threshold, both density and phase fluctuations are relevant. While strong emphasis has been given to the investigation of phase fluctuations, which dominate the physics of the quantum system away from the critical point, number fluctuations have been much less explored even in thermal equilibrium. In this work, we report experimental observation and theoretical description of fluctuations in a circularly confined nonequilibrium Bose-Einstein condensate of polaritons near the condensation threshold. We observe critical fluctuations, which combine the number fluctuations of a single-mode condensate state and competition between different states. The latter is analogous to mode hopping in photon lasers. Our theoretical analysis indicates that this phenomenon is of a quantum character, while classical noise of the pump is not sufficient to explain the experiments. The manifestation of a critical quantum state competition unlocks possibilities for the study of condensate formation while linking to practical realizations in photonic lasers.

Original languageEnglish (US)
Article numberadi6762
JournalScience Advances
Volume10
Issue number12
DOIs
StatePublished - Mar 2024
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

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