2011/12/31 by Kuei Sun, C. J. Bolech · 2 citations
Physics and Astronomy · #Amplitude #Cold Atom Physics and Bose-Einstein Condensates #Compressibility #Condensed matter physics #Fermion #Hubbard model #Magnetic field #Magnetization #Mechanics #Optical lattice #Pairing #Phase (matter) #Phase diagram #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum tunnelling #Quantum, superfluid, helium dynamics #Superconductivity #Superfluidity #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.85.051607
published as Phys. Rev. A 85, 051607(R) (2012) · 5 pages, 4 figures
openalex publication_date 2012/05/30 · arxiv created 2012/05/31 · arxiv updated 2012/06/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study two-species fermion gases with attractive interaction in two-dimensional optical lattices, producing an array of elongated tube confinements. Focusing on the interplay of Cooper pairing, spin imbalance (or magnetization), and intertube tunneling, we find the pairing gap can exhibit oscillatory behavior both along and across the tubes, reminiscent of a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. We obtain a Bose-Hubbard-like phase diagram that shows that the magnetization of the system undergoes an incompressible-compressible transition as a function of magnetic field and intertube tunneling strength. We find the parity of tube-filling imbalance in incompressible states is protected by that of the oscillatory pairing gap. Finally, we discuss signatures of this transition and thus (indirectly) of the FFLO pairing in cold-atom experiments.