Dissipation Mechanisms in Fermionic Josephson Junction

Wlazłowski, Gabriel; Xhani, Klejdja; Tylutki, Marek; Proukakis, N. P.; Magierski, Piotr

doi:10.1103/physrevlett.130.023003

Cited by 12 publications

(6 citation statements)

References 47 publications

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“…Moreover, the W-SLDA Toolkit has been applied to a variety of problems. Results were documented in papers [26,28,35,[41][42][43][44]. We have also confirmed stability of the results with respect to size of the integration time step dt (all presented here results were obtained with dt = 0.0025e −1 F ).…”

Section: Higgs Mode Decay: (T D < T)supporting

confidence: 82%

Generation and decay of Higgs mode in a strongly interacting Fermi gas

Barresi¹,

Boulet²,

Wlazłowski³

et al. 2023

Preprint

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We investigate the life cycle of the large amplitude Higgs mode in strongly interacting superfluid Fermi gas. Through numerical simulations with time-dependent density-functional theory and the technique of the interaction quench, we verify the previous theoretical predictions on the mode's frequency. Next, we demonstrate that the mode is dynamically unstable against external perturbation and qualitatively examine the emerging state after the mode decays. The post-decay state is characterized by spatial fluctuations of the order parameter and density at scales comparable to the superfluid coherence length scale. We identify similarities with FFLO states, which become more prominent at higher dimensionalities and nonzero spin imbalances.

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Section: Higgs Mode Decay: (T D < T)supporting

confidence: 82%

Generation and decay of Higgs mode in a strongly interacting Fermi gas

Barresi¹,

Boulet²,

Wlazłowski³

et al. 2023

Preprint

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“…To quantify these, we introduce flow and condensation energies. The former is just the kinetic energy associated with the flow, while the latter estimates the energy in the condensate (Cooper pairs) which uses a simple formula derived in the Bcs limit ( 32 ):…”

Section: Resultsmentioning

confidence: 99%

Fermionic quantum turbulence: Pushing the limits of high-performance computing

Wlazłowski,

Forbes,

Sarkar

et al. 2024

PNAS Nexus

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Ultracold atoms provide a platform for analog quantum computer capable of simulating the quantum turbulence that underlies puzzling phenomena like pulsar glitches in rapidly spinning neutron stars. Unlike other platforms like liquid helium, ultracold atoms have a viable theoretical framework for dynamics, but simulations push the edge of current classical computers. We present the largest simulations of fermionic quantum turbulence to date and explain the computing technology needed, especially improvements in the Eigenvalue soLvers for Petaflop Applications(ELPA) library that enable us to diagonalize matrices of record size (millions by millions). We quantify how dissipation and thermalization proceed in fermionic quantum turbulence by using the internal structure of vortices as a new probe of the local effective temperature. All simulation data and source codes are made available to facilitate rapid scientific progress in the field of ultracold Fermi gases.

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“…Our phenomenological model that captures these observations, in particular the identification of advective and diffusive modes along with the sigmoidal shape of I N (Δ μ + α c Δ T ), may help guide future microscopic theories of the system. While extensive research has been conducted on the entropy producing effects of topological excitations of the superfluid order parameter 8 , 12 , 21 , 39 , 41 , 45 – 49 , less attention has been given to their influence on entropy transport and the possible pair-breaking processes they can induce. Early studies of superconductors found that mobile vortices can advectively transport entropy by carrying pockets of normal fluid 50 with them 24 , 51 – 53 .…”

Section: Mainmentioning

confidence: 99%

Irreversible entropy transport enhanced by fermionic superfluidity

Fabritius,

Mohan,

Talebi

et al. 2024

Nat. Phys.

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The nature of particle and entropy flow between two superfluids is often understood in terms of reversible flow carried by an entropy-free, macroscopic wavefunction. While this wavefunction is responsible for many intriguing properties of superfluids and superconductors, its interplay with excitations in non-equilibrium situations is less understood. Here we observe large concurrent flows of both particles and entropy through a ballistic channel connecting two strongly interacting fermionic superfluids. Both currents respond nonlinearly to chemical potential and temperature biases. We find that the entropy transported per particle is much larger than the prediction of superfluid hydrodynamics in the linear regime and largely independent of changes in the channel’s geometry. By contrast, the timescales of advective and diffusive entropy transport vary significantly with the channel geometry. In our setting, superfluidity counterintuitively increases the speed of entropy transport. Moreover, we develop a phenomenological model describing the nonlinear dynamics within the framework of generalized gradient dynamics. Our approach for measuring entropy currents may help elucidate mechanisms of heat transfer in superfluids and superconducting devices.

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Dissipation Mechanisms in Fermionic Josephson Junction

Cited by 12 publications

References 47 publications

Generation and decay of Higgs mode in a strongly interacting Fermi gas

Generation and decay of Higgs mode in a strongly interacting Fermi gas

Fermionic quantum turbulence: Pushing the limits of high-performance computing

Irreversible entropy transport enhanced by fermionic superfluidity

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