6533b836fe1ef96bd12a08e3
RESEARCH PRODUCT
Reentrant Fulde-Ferrell-Larkin-Ovchinnikov superfluidity in the honeycomb lattice
Andrzej PtokAgnieszka CichyAgnieszka Cichysubject
Hubbard modelFOS: Physical sciences02 engineering and technology01 natural sciencesSuperconductivity (cond-mat.supr-con)SuperfluidityCondensed Matter - Strongly Correlated Electronssymbols.namesakeCondensed Matter::SuperconductivityLattice (order)0103 physical sciences010306 general physicsPhase diagramCondensed Matter::Quantum GasesSuperconductivityPhysicsZeeman effectStrongly Correlated Electrons (cond-mat.str-el)Condensed matter physicsCondensed Matter - Superconductivity021001 nanoscience & nanotechnologyMagnetic fieldReentrancyQuantum Gases (cond-mat.quant-gas)symbolsCondensed Matter - Quantum Gases0210 nano-technologydescription
We study superconducting properties of population-imbalanced ultracold Fermi mixtures in the honeycomb lattice that can be effectively described by the spin-imbalanced attractive Hubbard model in the presence of a Zeeman magnetic field. We use the mean-field theory approach to obtain ground state phase diagrams including some unconventional superconducting phases such as the Fulde--Ferrell--Larkin--Ovchinnikov (FFLO) phase. We show that this phase is characterized by atypical behaviour of the Cooper pairs total momentum in the external magnetic field. We show that the momentum changes its value as well as direction with change of the system parameters. We discuss the influence of van Hove singularities on the possibility of the reentrant FFLO phase occurrence, without a BCS precursor.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-10-17 | Physical Review A |