A variational description of the quantum phase transition in the sub-Ohmic spin-boson model

Details A variational description of the quantum phase transition in the sub-Ohmic spin-boson model A variational description of the quantum phase transition in the sub-Ohmic spin-boson model

2011-02-08

arxiv.org/abs/1102.1483v1

Phys. Rev. Lett. 107, 160601 (2011)

Physics

Quantum Physics

Scientific paper

The sub-ohmic spin-boson model is known to possess a novel quantum phase transition at zero temperature between a localised and delocalised phase. We present here an analytical theory based on a variational ansatz for the ground state, which describes a continuous localization transition with mean-field exponents for $0

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