"Weak Quantum Chaos" and its resistor network modeling

Details "Weak Quantum Chaos" and its resistor network modeling "Weak Quantum Chaos" and its resistor network modeling

2011-01-27

arxiv.org/abs/1101.5276v2

Phys.Rev.E83:066216,2011

Physics

Quantum Physics

18 pages, 11 figures, improved PRE accepted version

Scientific paper

10.1103/PhysRevE.83.066216

Weakly chaotic or weakly interacting systems have a wide regime where the common random matrix theory modeling does not apply. As an example we consider cold atoms in a nearly integrable optical billiard with displaceable wall ("piston"). The motion is completely chaotic but with small Lyapunov exponent. The Hamiltonian matrix does not look like one taken from a Gaussian ensemble, but rather it is very sparse and textured. This can be characterized by parameters $s$ and $g$ that reflect the percentage of large elements, and their connectivity, respectively. For $g$ we use a resistor network calculation that has a direct relation to the semi-linear response characteristics of the system, hence leading to a novel prediction regarding the rate of heating of cold atoms in optical billiards with vibrating walls.

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