Berry's Phase in the Presence of a Dissipative Medium

Details Berry's Phase in the Presence of a Dissipative Medium Berry's Phase in the Presence of a Dissipative Medium

2000-03-14

arxiv.org/abs/quant-ph/0003049v3

Physica {\bf A307} (2002) 142

Physics

Quantum Physics

19 pages, 2 figures

Scientific paper

10.1016/S0378-4371(01)00589-1

We consider the spin 1/2 model coupled to a slowly varying magnetic field in the presence of a weak damping represented by a Lindblad-form operators. We show that Berry's geometrical phase remains unaltered by the two dissipation mechanism considered. Dissipation effects are twofold: a shrinking in the modulus of the Bloch's vector, which characterizes coherence loss and a time dependent (dissipation related) precession angle. We show that the line broadening of the Fourier transformation of the components of magnetization is only due to the presence of dissipation.

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