A Dynamical Study of the Quantum p=2 Spherical Model

Details A Dynamical Study of the Quantum p=2 Spherical Model A Dynamical Study of the Quantum p=2 Spherical Model

2003-01-11

arxiv.org/abs/cond-mat/0301166v2

Phys. Rev. B 69, 094403 (2004)

Physics

Condensed Matter

Disordered Systems and Neural Networks

13 pages, 4 figures; published version

Scientific paper

10.1103/PhysRevB.69.094403

We present a dynamical study of the disordered quantum p=2 spherical model at long times. Its phase behavior as a function of spin-bath coupling, strength of quantum fluctuations and temperature is characterized, and we identify different paramagnetic and coarsened regions. A quantum critical point at zero temperature in the limit of vanishing dissipation is also found. Furthermore we show analytically that the fluctuation-dissipation theorem is obeyed in the stationary regime.

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