2009/10/31 by I. Zapata, Bernhard Wünsch, B. Wunsch +3 · 22 citations
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Fermion #Lattice (music) #Optical lattice #Pairing #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum, superfluid, helium dynamics #Superconductivity #Superfluidity #cond-mat.mes-hall #cond-mat.quant-gas #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.105.095301
published in Physical Review Letters 105(9), 095301 (American Physical Society) · 4.3 pages, 4 figures, published version
openalex publication_date 2010/08/23 · arxiv created 2010/09/28 · arxiv updated 2010/09/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study a balanced two-component system of ultracold fermions in one dimension with attractive interactions and subject to a spin-dependent optical lattice potential of opposite sign for the two components. We find states with different types of modulated pairing order parameters which are conceptually similar to π phases discussed for superconductor-ferromagnet heterostructures. Increasing the lattice depth induces sharp transitions between states of different parity. While the origin of the order parameter oscillations is similar to the Fulde-Ferrel-Larkin-Ovchinnikov phase for paired states with spin imbalance, the current system is intrinsically stable to phase separation. We discuss experimental requirements for creating and probing these novel phases.