Josephson effect at finite temperature along the BCS-BEC crossover

Piselli, Verdiana; Simonucci, Stefano; Strinati, G. C.

doi:10.1103/physrevb.102.144517

Cited by 13 publications

(8 citation statements)

References 60 publications

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“…Theoretical model.-The BCS regime of the superfluid Fermi gas is studied by means of the time-dependent Bogoliubov-de Gennes (BdG) equations [18]; until now, essentially all such fermionic Josephson junction studies were limited to considerations of either static cases [19][20][21] or 1D scenarios [22] (with a simplified two-mode model considered in Refs. [23,24]).…”

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confidence: 99%

Dissipation Mechanisms in Fermionic Josephson Junction

et al. 2023

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We characterize numerically the dominant dynamical regimes in a superfluid ultracold fermionic Josephson junction. Beyond the coherent Josephson plasma regime, we discuss the onset and physical mechanism of dissipation due to the superflow exceeding a characteristic speed, and provide clear evidence distinguishing its physical mechanism across the weakly and strongly interacting limits, despite qualitative dynamics of global characteristics being only weakly sensitive to the operating dissipative mechanism. Specifically, dissipation in the strongly interacting regime occurs through the phase-slippage process, caused by the emission and propagation of quantum vortices, and sound waves-similar to the Bose-Einstein condensation limit. Instead, in the weak interaction limit, the main dissipative channel arises through the pair-breaking mechanism.

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confidence: 99%

Dissipation Mechanisms in Fermionic Josephson Junction

et al. 2023

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“…Finally, integrating the latter expression in the number density one retrieves the beyond-mean-field energy density. Considering also (23), the Lagrangian density acquires a new term…”

Section: Beyond-mean-field: D = 3 Casementioning

confidence: 99%

“…Analysis with D = 1 [12,13] and D = 2 [14,15] have highlighted the emergence of novel dissipation mechanisms, dispersive shock waves and BKT transition. Moreover, the tunability of the interaction strength via Feshbach resonances allowed investigations with fermionic superfluids near the BEC-BCS crossover, in experimental [16][17][18][19] and theoretical [20][21][22][23] studies. In the case of fermionic superfluid, the role of dimensionality has been experimentally investigated in the D = 2 case [24].…”

Section: Introductionmentioning

confidence: 99%

Quantum fluctuations in atomic Josephson junctions: the role of dimensionality

Bardin,

Lorenzi,

Salasnich

2024

New J. Phys.

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We investigate the role of quantum fluctuations in the dynamics of a bosonic Josephson junction in $D$ spatial dimensions, by using beyond mean-field Gaussian corrections. We derive some key dynamical properties in a systematic way for $D=1, 2, 3$, namely, we compute the Josephson frequency in the low population imbalance limit, and we obtain the critical strength of the macroscopic quantum self-trapping. Our results show that the quantum corrections increase Josephson frequency in the $D=2, 3$ case, and a decrease in the $D=1$ case. Also, we show that the macroscopic quantum self-trapping critical strength is decreased in the $D=2, 3$ case, and increased in the $D=1$ case with respect to the mean-field calculations. We show that the difference between the cases of $D=2$ and $D=3$ on one side, and $D=1$ on the other, can be related to the qualitatively different dependence of the interaction strength on the scattering length in the different dimensions.

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“…While such work thoroughly addressed the T = 0 pure superfluid dynamical regimes, few studies to date have studied the effects of thermal, or quantum, excitations [31,36,50,[54][55][56][57][58][59][60][61][62] . This can be crucial, since experiments are typically performed at small, but non-zero, temperatures T T c (where T c is the critical temperature for Bose-Einstein condensation): in fact, evidence of thermal dissipation in the self-trapped regime has already been experimentally observed in [14].…”

Section: Introductionmentioning

confidence: 99%