Quantum Phase Transition in the Sub-Ohmic Spin-Boson Model: Extended Coherent-state Approach

Details Quantum Phase Transition in the Sub-Ohmic Spin-Boson Model: Extended Coherent-state Approach Quantum Phase Transition in the Sub-Ohmic Spin-Boson Model: Extended Coherent-state Approach

2009-12-10

arxiv.org/abs/0912.1991v2

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.

Affiliated with

Also associated with

No associations

Rating

Quantum Phase Transition in the Sub-Ohmic Spin-Boson Model: Extended Coherent-state Approach does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Quantum Phase Transition in the Sub-Ohmic Spin-Boson Model: Extended Coherent-state Approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum Phase Transition in the Sub-Ohmic Spin-Boson Model: Extended Coherent-state Approach will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-594847