Monday, July 8, 2013

1307.1491 (Stefan S. Natu et al.)

Long time non-equilibrium dynamics of binary Bose condensates    [PDF]

Stefan S. Natu, S. Das Sarma
We explore the out-of-equilibrium temporal dynamics of demixing and phase separation in a two dimensional binary Bose fluid at zero temperature, following a sudden quench across the miscible-immiscible phase boundary. On short timescales, the system rapidly settles into a steady state characterized by short-range correlations in the relative density. The subsequent dynamics is extremely slow: domains of the relative density appear to grow with time, however, the rate of growth is much slower than that predicted by conventional theories of phase ordering kinetics. Moreover, we find that the growth dynamics slows down with increasing time, and is consistent with logarithmic growth. Our study sheds light on ongoing investigations of how isolated quantum systems approach equilibrium, and indicates that studying the quantum phase diagram of the binary Bose fluids following a quench, may be difficult due to equilibration problems.
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