Abstract
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 πphases 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.
Highlights
The Harvard community has made this article openly available
The only unambiguous demonstration of FFLO-like physics has been achieved in heterostructures of ferromagnetic and superconducting (F/SC) layers, where proximity coupling through ferromagnetic layers results in superconducting π-junctions
The biggest difficulty is that FFLO phases are fragile and extremely susceptible to phase separation and the experimental situation remains controversial [6, 7, 8, 9, 10]
Summary
The Harvard community has made this article openly available. Please share how this access benefits you. “Pi Phases in Balanced Fermionic Superfluids on Spin-Dependent Optical Lattices.” Physical Review Letters 105 (9) (August 23). Π-phases in balanced fermionic superfluids on spin-dependent optical lattices
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