論文

査読有り
2012年4月

Many-body effects in a Bose-Fermi mixture

PHYSICAL REVIEW A
  • Kazuto Noda
  • ,
  • Robert Peters
  • ,
  • Norio Kawakami
  • ,
  • Thomas Pruschke

85
4
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevA.85.043628
出版者・発行元
AMER PHYSICAL SOC

We investigate many-body effects on a mixture of interacting bosons and fermions loaded in an optical lattice using a generalized dynamical mean-field theory combined with the numerical renormalization group. We show that strong correlation effects emerge in the presence of bosonic superfluidity, leading to a renormalized peak structure near the Fermi level in the density of states for fermions. Remarkably, this kind of strong renormalization appears not only in the metallic phase but also in the insulating phases of fermions such as in the empty-and filled-band limit. A systematic analysis of the relation between the quasiparticle weight and the strength of superfluidity reveals that the renormalization effect is indeed caused by the boson degrees of freedom. It is found that such renormalization is also relevant to a supersolid phase consisting of a density-wave ordering of fermions accompanied by bosonic superfluidity. This sheds light on the origin of the peak structure in the supersolid phase.

Web of Science ® 被引用回数 : 2

リンク情報
DOI
https://doi.org/10.1103/PhysRevA.85.043628
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000303384900012&DestApp=WOS_CPL
ID情報
  • DOI : 10.1103/PhysRevA.85.043628
  • ISSN : 1050-2947
  • Web of Science ID : WOS:000303384900012

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