2005/10/31 by J. Dukelsky, G. Ortiz, Gerardo Ortíz +4
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Cooper pair #Electron #Fermi Gamma-ray Space Telescope #Fermi gas #Ground state #Pairing #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum mechanics #Quantum phase transition #Quantum, superfluid, helium dynamics #Superconductivity #Superfluidity #cond-mat.other #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.96.180404
published as Phys.Rev.Lett.96:180404,2006 · Revised version accepted for publication
openalex publication_date 2006/05/10 · arxiv created 2006/05/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We introduce an exactly solvable model to study the competition between the Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) and breached-pair superfluid in strongly interacting ultracold asymmetric Fermi gases. One can thus investigate homogeneous and inhomogeneous states on equal footing and establish the quantum phase diagram. For certain values of the filling and the interaction strength, the model exhibits a new stable exotic pairing phase which combines an inhomogeneous state with an interior gap to pair excitations. It is proven that this phase is the exact ground state in the strong-coupling limit, while numerical examples in finite lattices show that also at finite interaction strength it can have lower energy than the breached-pair or LOFF states.