• Editors' Suggestion
  • Rapid Communication

Quantum phase transition in the sub-Ohmic spin-boson model: An extended coherent-state approach

Yu-Yu Zhang, Qing-Hu Chen, and Ke-Lin Wang
Phys. Rev. B 81, 121105(R) – Published 26 March 2010

Abstract

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.

  • Figure
  • Figure
  • Figure
  • Received 27 January 2010

DOI:https://doi.org/10.1103/PhysRevB.81.121105

©2010 American Physical Society

Authors & Affiliations

Yu-Yu Zhang1, Qing-Hu Chen2,1,*, and Ke-Lin Wang3,4

  • 1Department of Physics, Zhejiang University, Hangzhou 310027, People’s Republic of China
  • 2Center for Statistical and Theoretical Condensed Matter Physics, Zhejiang Normal University, Jinhua 321004, People’s Republic of China
  • 3Department of Physics, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
  • 4Department of Modern Physics, University of Science and Technology of China, Hefei 230026, People’s Republic of China

  • *Corresponding author; qhchen@zju.edu.cn

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 81, Iss. 12 — 15 March 2010

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×