Journal
PHYSICAL REVIEW B
Volume 81, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.121105
Keywords
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Funding
- National Natural Science Foundation of China, PCSIRT [IRT0754]
- National Basic Research Program of China [2009CB929104]
- Zhejiang Provincial Natural Science Foundation [Z7080203]
- Program for Innovative Research Team in Zhejiang Normal University
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We propose a general extended coherent state approach to the qubit (or fermion) and multimode boson coupling systems. The application to the spin-boson model with the discretization of a bosonic bath with arbitrary continuous spectral density is described in detail, and very accurate solutions can be obtained. The quantum phase transition in the nontrivial sub-Ohmic case can be located by the fidelity and the order-parameter critical exponents for the bath exponents s < 1/2 can be correctly given by the fidelity susceptibility, demonstrating the strength of the approach.
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