Physics – Condensed Matter – Quantum Gases
Scientific paper
2009-12-10
Phys. Rev. B 81, 121105 (R)(2010)
Physics
Condensed Matter
Quantum Gases
4 pages, 3 figures
Scientific paper
We propose a general extended coherent state approach to the qubit (or fermion) and multi-mode 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.
Chen Qing-Hu
Wang Ke-Lin
Zhang Yu-Yu
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