Dynamics of a large spin with weak dissipation

Details Dynamics of a large spin with weak dissipation Dynamics of a large spin with weak dissipation

2003-12-16

arxiv.org/abs/quant-ph/0312140v1

Chemical Physics 296, 295 (2004)

Physics

Quantum Physics

11 pages, 3 figures, to appear in Chemical Physics Special Issue on the Spin-Boson Problem, ed. by H. Grabert and A. Nitzan

Scientific paper

10.1016/j.chemphys.2003.08.030

We investigate the generalization of the spin-boson model to arbitrary spin size. The Born-Markov approximation is employed to derive a master equation in the regime of small coupling strengths to the environment. For spin one half, the master equation transforms into a set of Bloch equations, the solution of which is in good agreement with results of the spin-boson model for weak ohmic dissipation. For larger spins, we find a superradiance-like behavior known from the Dicke model. The influence of the nonresonant bosons of the dissipative environment can lead to the formation of a beat pattern in the dynamics of the $z$-component of the spin. The beat frequency is approximately proportional to the cutoff $\omega_c$ of the spectral function.

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