Papers

Peer-reviewed
Nov, 2007

Continuous-time quantum Monte Carlo method for the Coqblin-Schrieffer model

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
  • Junya Otsuki
  • ,
  • Hiroaki Kusunose
  • ,
  • Philipp Werner
  • ,
  • Yoshio Kuramoto

Volume
76
Number
11
First page
114707
Last page
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1143/JPSJ.76.114707
Publisher
PHYSICAL SOC JAPAN

An impurity solver based on a continuous-time quantum Monte Carlo method is developed for the Coqblin-Schrieffer model. The Monte Carlo simulation does not encounter a sign problem for antiferromagnetic interactions, and accurately reproduces the Kondo effect. Our algorithm can deal with an arbitrary number N of local degrees of freedom, becomes more efficient for larger values of N, and is hence suitable for models with orbital degeneracy. The dynamical susceptibility and the impurity t-matrix are derived with the aid of the Pade approximation for various values of N, and good agreement is found with other methods and available exact results. We point out that the Korringa-Shiba relation needs correction for a finite value of the exchange interaction.

Link information
DOI
https://doi.org/10.1143/JPSJ.76.114707
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000251121900057&DestApp=WOS_CPL
ID information
  • DOI : 10.1143/JPSJ.76.114707
  • ISSN : 0031-9015
  • Web of Science ID : WOS:000251121900057

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