Two-dimensional superfluidity of exciton-polaritons requires strong anisotropy
By E. Altman, Lukas M. Sieberer, Leiming Chen, S. Diehl, J. Toner. 2013
153 citations recorded by the source corpus.
Fluids of exciton-polaritons, excitations of two dimensional quantum wells in optical cavities, show collective phenomena akin to Bose condensation. However, a fundamental difference from standard condensates stems from the finite life-time of these excitations, which necessitate continuous driving to maintain a steady state. A basic question is whether a two dimensional condensate with long range algebraic correlations can exist under these non-equilibrium conditions. Here we show that such driven two-dimensional Bose systems cannot exhibit algebraic superfluid order except in low-symmetry, anisotropic systems. Our result implies, in particular, that recent apparent evidence for Bose condensation of exciton-polaritons must be an intermediate scale crossover phenomenon, while the true long distance correlations fall off exponentially. We obtain these results through a mapping of the long-wavelength condensate dynamics onto the anisotropic Kardar-Parisi-Zhang equation.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/bb4bd812e2c948615ef246a8045525400255eca4
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Artificial Intelligence
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Keldysh field theory for driven open quantum systems (2015, methodology): “[19], an effective long-wavelength description of a driven-dissipative condensate with the condensate phase as the single dominant gapless degree of freedom (cf.”
- Quantum simulation with interacting photons (2016, background): “For further work on non-equilibrium photon condensation, see [3, 144, 236], as well as the reviews [39, 235] and references therein.”