Finite Temperature Properties of Three-Component Fermion Systems in Optical Lattice

Sei-ichiro Suga, Kensuke Inaba

佑紀 岡南, Yuki Okanami, Nayuta Takemori +2 more

Sei-ichiro Suga, Kensuke Inaba

Ian G. White, Randall G. Hulet, Kaden R. A. Hazzard

Hiromasa Yanatori, Akihisa Koga

We investigate finite temperature properties in the half-filled three-component (colors) fermion systems. It is clarified that a color density-wave (CDW) state is more stable than a color-selective "antiferromagnetic" (CSAF) state against thermal fluctuations. The reentrant behavior in the phase boundary for the CSAF state is found. We also address the maximum critical temperature of the translational symmetry breaking states in the multicomponent fermionic systems.

Kensuke Inaba, Sei-ichiro Suga

We investigate the finite-temperature properties of attractive three-component (colors) fermionic atoms in optical lattices using a self-energy functional approach. As the strength of the attractive interaction increases in the low-temperature region, we observe a second-order transition from a Fermi liquid to a color superfluid (CSF), where atoms from two of the three colors form Cooper pairs. In the strong attractive region, we observe a first-order transition from a CSF to a trionic state, where three atoms with different colors form singlet bound states. A crossover between a Fermi liquid and a trionic state is observed in the high-temperature region. We present a phase diagram covering zero to finite temperatures. We demonstrate that the CSF transition temperature is enhanced by the anisotropy of the attractive interaction.