Exact dynamics of charge fluctuations in the multichannel interacting resonant level model

Annamária Kiss, Yoshio Kuramoto, Junya Otsuki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A modified version of the spinless Anderson model is studied by means of the continuous-time quantum Monte Carlo method. This study is motivated by the peculiar heavy-fermion behavior observed in certain Samarium compounds, which is insensitive to magnetic field. The model involves M channels for conduction electrons, all of which interact with local f electron via the Coulomb repulsion Ufc, while only one channel has hybridization with the local state. The effective hybridization is reduced by the Anderson orthogonality effect, and a quantum critical point occurs with increasing M and=or increasing Ufc. The numerical results at finite temperature of the local charge susceptibility are well fitted by a simple scaling theory for all M. However, the single-particle spectrum is described by a double Lorentzian for M > 1, in contrast with the single Lorentzian with M = 1. A quasi-particle perturbation theory is presented that reproduces the quantum critical point for large M. The quasi-particle theory gives not only the renormalized energy scale, but its extrapolation toward higher energies being consistent with the double Lorentzian spectrum.

Original languageEnglish
Article number104602
Journaljournal of the physical society of japan
Volume84
Issue number10
DOIs
Publication statusPublished - Oct 15 2015

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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