| Description |
Marzena H. Szymanska
Department of Physics and Astronomy
University College London
Driven-dissipative quantum fluids of light, experimentally realised in for example semiconductor microcavities, circuit or cavity QED systems, provide a unique testbed to explore new non-equilibrium quantum phenomena. I will review recent progress in this field. In particular, we show that polariton quantum fluid can exhibit a non-equilibrium order, where superfluidity is accompanied by stretched exponential decay of correlations [1]. This celebrated Kardar-Parisi-Zhang (KPZ) phase has not been achieved before in any system in 2D, and even 1D realisations have not been conclusive. I will then discuss how these systems can undergo other unconventional phase transitions and orders [2], and display flow properties connected but distinct from conventional superfluidity. Finally, when placed in strained honeycomb lattice potentials, polariton fluids can condense into a rotating state, the lowest Landau level, forming a vortex array and spontaneously breaking time reversal symmetry [3]. Describing strong quantum correlations in open systems with drive and dissipation, especially in two dimensions, is a numerical challenge. I will briefly present our attempts at developing suitable methods, based on stochastic and tensor network approaches [4].
[1] A. Zamora et al, PRX 7, 041006 (2017); PRL 125, 265701 (2020); A. Ferrier et al, PRB 105, 205301 (2022) [2] G. Dagvadorj et al, PRL 130, 136001 (2023); PRB 104, 165301 (2021) [3] C. Lledo et al, SciPost 12, 068 (2022) [4] C. Mc Keever et al, PRX 11, 021035 (2021); P. Deuar et al, PRX Quantum, 2, 010319 (2021) |
Joint ICTP/SISSA CMSP Seminar: Novel Non-equilibrium Phenomena in Quantum Fluids of Light
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