INVESTIGADORES
ERMANN Leonardo
artículos
Título:
Quantum Gibbs distribution from dynamical thermalization in classical nonlinear lattices
Autor/es:
LEONARDO ERMANN; DIMA L. SHEPELYANSKY
Revista:
NEW JOURNAL OF PHYSICS
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2013 vol. 15 p. 123004 - 123021
ISSN:
1367-2630
Resumen:
We study numerically time evolution in classical lattices with weak
or moderate nonlinearity which leads to interactions between linear modes.
Our results show that in a certain strength range a moderate nonlinearity
generates a dynamical thermalization process which drives the system to the
quantum Gibbs distribution of probabilities, or average oscillation amplitudes.
The effective dynamical temperature of the lattice varies from large positive
to large negative values depending on the energy of the initially excited
modes. This quantum Gibbs distribution is drastically different from the usually
expected energy equipartition over linear modes corresponding to a regime of
classical thermalization. Possible experimental observations of this dynamical
thermalization are discussed for cold atoms in optical lattices, nonlinear photonic
lattices and optical fiber arrays.