π phases in balanced fermionic superfluids on spin-dependent optical lattices.
Phys Rev Lett
; 105(9): 095301, 2010 Aug 27.
Article
em En
| MEDLINE
| ID: mdl-20868172
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 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.
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Espanha