Phase Transitions in Generalised Spin-Boson (Dicke) Models

Details Phase Transitions in Generalised Spin-Boson (Dicke) Models Phase Transitions in Generalised Spin-Boson (Dicke) Models

2004-01-07

arxiv.org/abs/quant-ph/0401029v1

Phys. Rev. A 69, 053804 (2004)

Physics

Quantum Physics

6 pages, 5 figues

Scientific paper

10.1103/PhysRevA.69.053804

We consider a class of generalised single mode Dicke Hamiltonians with arbitrary boson coupling in the pseudo-spin $x$-$z$ plane. We find exact solutions in the thermodynamic, large-spin limit as a function of the coupling angle, which allows us to continuously move between the simple dephasing and the original Dicke Hamiltonians. Only in the latter case (orthogonal static and fluctuating couplings), does the parity-symmetry induced quantum phase transition occur.

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