Critical Josephson current in BCS-BEC–crossover superfluids

Zaccanti, Matteo; Zwerger, W.

doi:10.1103/physreva.100.063601

Cited by 31 publications

(27 citation statements)

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“…We note that j c is described in terms of the bulk current and the tunneling amplitude for a 3D condensate in Refs. [29,30]. We determine the estimate I c = j c Ly by using V = V 0 and d ≈ 1.2w, and by determining c(T ) and n 0 numerically.…”

Section: Critical Currentmentioning

confidence: 99%

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Josephson junction dynamics in a two-dimensional ultracold Bose gas

Singh

Luick

Sobirey

et al. 2020

Phys. Rev. Research

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We investigate the Berezinskii-Kosterlitz-Thouless (BKT) scaling of the critical current of Josephson junction dynamics across a barrier potential in a two-dimensional Bose gas, motivated by recent experiments by Luick et al. [Science 369, 89 (2020)]. Using classical-field dynamics, we determine the dynamical regimes of this system as a function of temperature and barrier height. As a central observable we determine the current-phase relation as a defining property of these regimes. In addition to the ideal junction regime, we find a multimode regime, a second-harmonic regime, and an overdamped regime. For the ideal junction regime, we derive an analytical estimate for the critical current, which predicts the BKT scaling. We demonstrate this scaling behavior numerically for varying system sizes. The estimates of the critical current show excellent agreement with the numerical simulations and the experiments. Furthermore, we show that the damping of the supercurrent is associated with the phonon excitations in the bulk, and the nucleation of vortex-antivortex pairs in the junction.

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Section: Critical Currentmentioning

confidence: 99%

“…[19] and their theoretical investigation reported in Refs. [20][21][22][23][24][25][26][27][28][29][30][31]. Currentphase relations of atomic JJs were measured in Refs.…”

Section: Introductionmentioning

confidence: 99%

Josephson junction dynamics in a two-dimensional ultracold Bose gas

Singh

Luick

Sobirey

et al. 2020

Phys. Rev. Research

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“…This new effect, as well as the observation [10] of Josephson oscillations (JO), have been observed in a single BJJ [11,12]. This has raised a lot of interest in the study of BJJ and ongoing theoretical and experimental studies deal with dissipative [5,[13][14][15][16] and non-dissipative oscillations [17][18][19], supercurrent dynamics in ring shaped condensates [20][21][22], current phase relation of atomic BJJ [23,24], quantum transport [25,26], as well as their counterparts with fermionic superfluid atomic samples [27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 83%

Dynamical phase diagram of a one-dimensional Bose gas in a box with a tunable weak link: From Bose-Josephson oscillations to shock waves

Saha

Dubessy²

2021

Phys. Rev. A

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We study the dynamics of one-dimensional bosons trapped in a box potential, in the presence of a barrier creating a tunable weak-link, thus realizing a one dimensional Bose-Josephson junction. By varying the initial population imbalance and the barrier height we evidence different dynamical regimes. In particular we show that at large barriers a two mode model captures accurately the dynamics, while for low barriers the dynamics involves dispersive shock waves and solitons. We study a quench protocol that can be readily implemented in experiments and show that self-trapping resonances can occur. This phenomenon can be understood qualitatively within the two-mode model.

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“…Given that our study identifies more than one relevant superfluid oscillations frequencies both at T = 0 and in the T > 0 regimes, it is appropriate here to briefly summarize prior relevant work identifying such multiple frequencies and the role of their arising couplings [19,20,38,55,61,[64][65][66][67].…”

Section: Second Order Josephson Junction Contributionsmentioning

confidence: 99%