The new physics of non-equilibrium condensates: insights from classical dynamics
Citation:
Eastham, PR, The new physics of non-equilibrium condensates: insights from classical dynamics, Journal of Physics: Condensed Matter, 19, 29, 2007, 295210Download Item:
Abstract:
We discuss the dynamics of classical Dicke-type models, aiming to
clarify the mechanisms by which coherent states could develop in potentially
non-equilibrium systems such as semiconductor microcavities. We present
simulations of an undamped model which show spontaneous coherent states
with persistent oscillations in the magnitude of the order parameter. These
states are generalisations of superradiant ringing to the case of inhomogeneous
broadening. They correspond to the persistent gap oscillations proposed in
fermionic atomic condensates, and arise from a variety of initial conditions. We
show that introducing randomness into the couplings can suppress the oscillations,
leading to a limiting dynamics with a time-independent order parameter. This
demonstrates that non-equilibrium generalisations of polariton condensates can
be created even without dissipation. We explain the dynamical origins of the
coherence in terms of instabilities of the normal state, and consider how it can
additionally develop through scattering and dissipation.
Author's Homepage:
http://people.tcd.ie/easthampDescription:
PUBLISHED
Author: EASTHAM, PAUL
Type of material:
Journal ArticleCollections
Series/Report no:
Journal of Physics: Condensed Matter19
29
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Condensed matter physics, PolaritonsMetadata
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