Trionic phase of ultracold fermions in an optical lattice: A variational study

Ákos Rapp, Walter Hofstetter, Gergely Zaránd

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57 Citations (Scopus)


To investigate ultracold fermionic atoms of three internal states (colors) in an optical lattice, subject to strong attractive interaction, we study the attractive three-color Hubbard model in infinite dimensions by using a variational approach. We find a quantum phase transition between a weak-coupling superconducting phase and a strong-coupling trionic phase where groups of three atoms are bound to a composite fermion. We show how the Gutzwiller variational theory can be reformulated in terms of an effective field theory with three-body interactions and how this effective field theory can be solved exactly in infinite dimensions by using the methods of dynamical mean field theory.

Original languageEnglish
Article number144520
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
Publication statusPublished - Apr 22 2008

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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