Induced<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>P</mml:mi></mml:math>-Wave Superfluidity in Asymmetric Fermi Gases

Bulgac, Aurel; Forbes, Michael McNeil; Schwenk, A.

doi:10.1103/physrevlett.97.020402

Cited by 113 publications

(155 citation statements)

References 31 publications

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“…As an interesting example, it was proposed in [184] that e ective p-wave interactions between polarons could be induced by the interactions with majority atoms, and might lead to exotic p-wave super uidity at very low temperature. In order to reveal a Fermi liquid behavior, we plot our data as h − 1 as a function of (η − A) 5/2 (see Fig.5.10).…”

Section: Observation Of a Fermi Liquid Behaviormentioning

confidence: 99%

Thermodynamics of Ultracold Fermi Gases

Nascimbène

Navon

Chevy

et al. 2010

Latin America Optics and Photonics Conference

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Section: Observation Of a Fermi Liquid Behaviormentioning

confidence: 99%

Thermodynamics of Ultracold Fermi Gases

Nascimbène

Navon

Chevy

et al. 2010

Latin America Optics and Photonics Conference

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“…Berezinskii's triplet pairing correlations, involving different-time pairing, did not violate the Pauli principle by virtue of being odd in time, thus allowing a triplet state in a system with s-wave interactions. While such a state did not turn out to be appropriate to describe superfluidity in 3 He, its consideration has led the way to the study of cases where some sort of time-reversal symmetry breaking mechanism may allow an odd time triplet state to be induced in systems with spatially symmetric interactions.…”

Section: Introductionmentioning

confidence: 99%

“…Triplet states in systems with s-wave pairing, even in momentum or coordinate space, would naively appear to violate the Pauli principle. However, many years ago Berezinskii proposed 2 a triplet state in superfluid 3 He, which involved spatially symmetric correlations. Berezinskii's triplet pairing correlations, involving different-time pairing, did not violate the Pauli principle by virtue of being odd in time, thus allowing a triplet state in a system with s-wave interactions.…”

Section: Introductionmentioning

confidence: 99%

Induced triplet pairing in cleans-wave superconductor/ferromagnet layered structures

2008

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We study induced triplet pairing correlations in clean ferromagnet/superconductor/ferromagnet heterostructures. The pairing state in the superconductor is the conventional singlet s-wave, and the angle α between the magnetizations of the two ferromagnetic layers is arbitrary. We use a numerical fully self-consistent solution of the microscopic equations and obtain the time-dependent triplet correlations via the Heisenberg equations of motion. We find that in addition to the usual singlet correlations, triplet correlations, odd in time as required by the Pauli principle, are induced in both the ferromagnets and the superconductor. These time-dependent correlations are largest at times of order of the inverse of the Debye cutoff frequency, ωD, and we find that within that time scale they are often spatially very long ranged. We discuss the behavior of the characteristic penetration lengths that describe these triplet correlations. We also find that the ferromagnets can locally magnetize the superconductor near the interface, and that the local magnetization then undergoes strongly damped oscillations. The local density of states exhibits a variety of energy signatures, which we discuss, as a function of ferromagnetic strength and α.

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“…Since then, various exotic phases have been proposed for the mismatched case, such as the Larkin, Ovchinnikov, Fulde and Ferrel (LOFF)-phase [3], the breached pair superfluid phase (BP) [4], deformed Fermi surfaces [5], phase separation in real space [6,7], and also the possibility of new coexisting phases in the BEC regime [8]. Other pairing mechanisms beyond BCS, such as P-wave superfluidity, have also been investigated [9]. Observation of phase separation between a fully paired superfluid core surrounded by the unpaired excess atoms, have been reported independently by the Rice [10,11] and MIT [12,13] groups.…”

mentioning

confidence: 99%

Temperature effects in a Fermi gas with population imbalance

Caldas¹,

Mota²

2008

J. Stat. Mech.

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We investigate temperature effects in a Fermi gas with imbalanced spin populations. From the general expression of the thermal gap equation we find, in weak coupling limit, an analytical expression for the transition temperature Tc as a function of various possibilities of chemical potential and mass asymmetries between the two particle species. For a range of asymmetry between certain specific values, this equation always has two solutions for Tc which has been interpreted as a reentrant phenomena or a pairing induced by temperature effect. We show that the lower Tc is never related to a stable solution. The same results are obtained in strong coupling limit. The thermodynamical potential is carefully analyzed to avoid the consideration of the unstable solutions. We also obtain the tricritical points for the chemical potential and mass imbalanced cases, and beyond these points we properly minimize the thermodynamic potential to find the stable and metastable first order transition lines. The recent advances in experiments with ultracold fermionic atoms have provided the possibility for the understanding of superfluidity in several physical situations, from high temperature superconductivity to the pairing of quarks in the cores of neutron stars.When a two fermion species system have the same number of spin-up and spin-down particles, its ground state is described by the well known Bardeen-CooperSchrieffer (BCS) theory of superconductivity [1]. In this case, if the temperature is below a certain critical temperature (T c ), fermions with opposite spins interact near their common Fermi surface resulting in pair formation, even at arbitrarily weak coupling. For temperatures above T c the system is found to be in the normal state i.e., the fermions are unpaired. [6,7], and also the possibility of new coexisting phases in the BEC regime [8]. Other pairing mechanisms beyond BCS, such as P-wave superfluidity, have also been investigated [9]. Observation of phase separation between a fully paired superfluid core surrounded by the unpaired excess atoms, have been reported independently by the Rice [10,11] and MIT [12,13] groups. This phase separation can be viewed in terms of three phase transitions of different nature. Differently from the standard BCS thermodynamical phase transition we mentioned above, in an imbalanced system the phase * hcaldas@ufsj.edu.br † motaal@ufsj.edu.br transitions that may happen are: I. At zero temperature (T ), increasing the chemical potential or number asymmetry the system undergoes a (first-order) quantum phase transition to the normal state [6]; II. Still at T = 0, first order phase transitions occur from the normal to a phase separation (PS) phase, and from PS to a spatially homogeneous (magnetized) superfluid as the interaction parameter 1/k F a is varied [8,14], with a tricritical point sitting in the fully polarized line [14], and III. Lowering the temperature, a system with different and fixed number particles phase separates into a unpolarized superfluid core surrounded by a pol...

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InducedP-Wave Superfluidity in Asymmetric Fermi Gases

Cited by 113 publications

References 31 publications

Thermodynamics of Ultracold Fermi Gases

Thermodynamics of Ultracold Fermi Gases

Induced triplet pairing in cleans-wave superconductor/ferromagnet layered structures

Temperature effects in a Fermi gas with population imbalance

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