Triplet Pair Correlations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi></mml:math>-Wave Superfluids as a Signature of the Fulde-Ferrell-Larkin-Ovchinnikov State

Zapata, I.; Sols, Fernando; Demler, Eugene

doi:10.1103/physrevlett.109.155304

Cited by 7 publications

(10 citation statements)

References 37 publications

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“…10.1. Futhermore an interesting variant was proposed in [263] in which triplet correlations between atoms residing in the nodes of the oscillating LO-order parameter are mapped onto p-wave molecules. In 3D systems, the pair formation dynamics in the unitary regime were found to be very rapid [264].…”

Section: Ramps and Quenchesmentioning

confidence: 99%

The Fulde–Ferrell–Larkin–Ovchinnikov state for ultracold fermions in lattice and harmonic potentials: a review

et al. 2018

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We review the concepts and the present state of theoretical studies of spin-imbalanced superfluidity, in particular the elusive Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, in the context of ultracold quantum gases. The comprehensive presentation of the theoretical basis for the FFLO state that we provide is useful also for research on the interplay between magnetism and superconductivity in other physical systems. We focus on settings that have been predicted to be favourable for the FFLO state, such as optical lattices in various dimensions and spin-orbit coupled systems. These are also the most likely systems for near-future experimental observation of the FFLO state. Theoretical bounds, such as Bloch's and Luttinger's theorems, and experimentally important limitations, such as finite-size effects and trapping potentials, are considered. In addition, we provide a comprehensive review of the various ideas presented for the observation of the FFLO state. We conclude our review with an analysis of the open questions related to the FFLO state, such as its stability, superfluid density, collective modes and extending the FFLO superfluid concept to new types of lattice systems.

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Section: Ramps and Quenchesmentioning

confidence: 99%

The Fulde–Ferrell–Larkin–Ovchinnikov state for ultracold fermions in lattice and harmonic potentials: a review

et al. 2018

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“…As a result, the pairing wave function has a more complicated structure with both singlet and triplet components [22]. The triplet pairing correlations in s-wave superfluids may be used to detect the anisotropic Fulde-Ferrell-Larkin- Ovchinikov states [23]. In addition, 2D Fermi gases with SOC can exhibit p-wave character in the helicity bases.…”

Section: Chemical Potentialmentioning

confidence: 99%

BCS-BEC crossover in spin-orbit-coupled two-dimensional Fermi gases

2012

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The recent experimental realization of spin-orbit coupling for ultracold atoms has generated much interest in the physics of spin-orbit-coupled degenerate Fermi gases. Although recently the BCS-BEC crossover in three-dimensional (3D) spin-orbit-coupled Fermi gases has been intensively studied, the corresponding twodimensional (2D) crossover physics has remained unexplored. In this paper, we investigate, both numerically and analytically, the BCS-BEC crossover physics in 2D degenerate Fermi gases in the presence of the Rashba type of spin-orbit coupling. We derive the mean-field gap and atom-number equations suitable for 2D spin-orbit-coupled Fermi gases and solve them numerically and self-consistently, from which the dependence of the ground-state properties (chemical potential, superfluid pairing gap, ground-state energy per atom) on the system parameters (e.g., binding energy, spin-orbit-coupling strength) is obtained. Furthermore, we derive analytical expressions for these ground-state quantities, which agree well with our numerical results within a broad parameter region. Such analytical expressions also agree qualitatively with previous numerical results for 3D spin-orbit-coupled Fermi gases, where analytical results are lacking. We show that, with increasing spin-orbit coupling (SOC) strength, the chemical potential is shifted by a constant determined by the SOC strength. The superfluid pairing gap is enhanced significantly in the BCS limit for strong SOC, but increases only slightly in the BEC limit.

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“…The signature of the FF superfluids can be detected by the pair correlations [48]. At the critical transition point, the pair correlations will exhibit a discontinuous behavior by tuning μ.…”

Section: Pair Correlationmentioning

confidence: 99%

“…In figure 4(a), we have known that the order parameter Δ hosts a discontinuous evolution during the transition from the BCS to FF states. This discontinuous behavior will influence on the pair correlations [48].…”

Section: Pair Correlationmentioning

confidence: 99%

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Fulde–Ferrell superfluids in spinless ultracold Fermi gases

et al. 2018

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The Fulde-Ferrell (FF) superfluid phase, in which fermions form finite momentum Cooper pairings, is well studied in spin-singlet superfluids in past decades. Different from previous works that engineer the FF state in spinful cold atoms, we show that the FF state can emerge in spinless Fermi gases confined in optical lattice associated with nearest-neighbor interactions. The mechanism of the spinless FF state relies on the split Fermi surfaces by tuning the chemistry potential, which naturally gives rise to finite momentum Cooper pairings. The phase transition is accompanied by changed Chern numbers, in which, different from the conventional picture, the band gap does not close. By beyond-mean-field calculations, we find the finite momentum pairing is more robust, yielding the system promising for maintaining the FF state at finite temperature. Finally we present the possible realization and detection scheme of the spinless FF state.

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Triplet Pair Correlations ins-Wave Superfluids as a Signature of the Fulde-Ferrell-Larkin-Ovchinnikov State

Cited by 7 publications

References 37 publications

The Fulde–Ferrell–Larkin–Ovchinnikov state for ultracold fermions in lattice and harmonic potentials: a review

The Fulde–Ferrell–Larkin–Ovchinnikov state for ultracold fermions in lattice and harmonic potentials: a review

BCS-BEC crossover in spin-orbit-coupled two-dimensional Fermi gases

Fulde–Ferrell superfluids in spinless ultracold Fermi gases

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