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Journal of Low Temperature Physics

, Volume 158, Issue 1–2, pp 79–84 | Cite as

Magnetically Ordered State of Cold Fermions on a Decorated Square Lattice

  • Kazuto Noda
  • Akihisa Koga
  • Norio Kawakami
  • Thomas Pruschke
Open Access
Article

Abstract

We study two-component ultracold fermions with repulsive interactions, which are loaded into a decorated square lattice. By combining the real-space dynamical mean-field theory with the numerical renormalization group method, we discuss magnetic properties in the system. It is clarified how the ferromagnetically ordered ground state, which is stabilized by a flat band mechanism, is adiabatically connected to the ferrimagnetically ordered state expected in the strong coupling limit.

Keywords

Optical lattice Fermion Ferromagnetism 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Kazuto Noda
    • 1
  • Akihisa Koga
    • 2
  • Norio Kawakami
    • 1
  • Thomas Pruschke
    • 3
  1. 1.Department of Physics, Graduate School of ScienceKyoto UniversityKyotoJapan
  2. 2.Department of PhysicsTokyo Institute of TechnologyTokyoJapan
  3. 3.Institut für Theoretische PhysikUniversität GöttingenGöttingenGermany

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