Lane formation in a driven attractive fluid

Wächtler, Christopher W.; Kogler, Florian; Klapp, Sabine H. L.

doi:10.1103/physreve.94.052603

Cited by 39 publications

(51 citation statements)

References 47 publications

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“…Note that a similar model, obtained by means of a local density approximation, has been used also for the description of dipolar quantum droplets [19][20][21].…”

Section: B Non-linear Regimementioning

confidence: 99%

Dynamical formation of quantum droplets in a K39 mixture

Ferioli

Semeghini

Terradas-Briansó

et al. 2020

Phys. Rev. Research

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We report on the dynamical formation of self-bound quantum droplets in attractive mixtures of 39 K atoms. Considering the experimental observations of Semeghini et al., Phys. Rev. Lett. 120, 235301 (2018), we perform numerical simulations to understand the relevant processes involved in the formation of a metastable droplet from an out-of-equilibrium mixture. We first analyze the so-called self-evaporation mechanism, where the droplet dissipates energy by releasing atoms, and then we consider the effects of losses due to three-body recombinations and to the balancing of populations in the mixture. We discuss the importance of these three mechanisms in the observed droplet dynamics and their implications for future experiments.

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“…Note that a similar model, obtained by means of a local density approximation, has been used also for the description of dipolar quantum droplets [19][20][21].…”

Section: B Non-linear Regimementioning

confidence: 99%

Dynamical formation of quantum droplets in a K39 mixture

Ferioli

Semeghini

Terradas-Briansó

et al. 2020

Phys. Rev. Research

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“…Experimental breakthroughs in realizing dipolar quantum gases of dysprosium [14] and erbium [15] atoms have raised promise for observing supersolidity arising from their atomic interactions. Indeed a series of recent experiments have revealed a roton-maxon excitation spectrum [16] in close analogy to the physics of superfluid helium [17], and reported the observation of pattern formation [18] as well as self-confined quantum droplet states [19][20][21], arising from the interplay of short-range collisions, dipolar interactions and quantum fluctuations [22,23]. Theoretical work has explored the formation of regular quantum droplet arrangements under various conditions [22,[24][25][26][27] and the temporary coexistence of phase coherence and density modulations along one spatial dimension [27,28] has been reported recently.…”

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confidence: 99%

Supersolidity around a Critical Point in Dipolar Bose-Einstein Condensates

2019

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We explore spatial symmetry breaking of a dipolar Bose Einstein condensate in the thermodynamic limit and reveal a critical point in the phase diagram at which crystallization occurs via a second-order phase transition. This behavior is traced back to the significant effects of quantum fluctuations in dipolar condensates, which moreover stabilize a new supersolid phase, namely a regular honeycomb pattern with maximal modulational contrast and near-perfect superfluidity. arXiv:1903.06161v1 [cond-mat.quant-gas]

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“…In particular, inhomogeneities in the shear rate can induce particle migration 10 and thus lead to inhomogeneities in the density profile. Examples of this mechanism are lane formation, where particles move in stacked layers separated by low density bands 11,12 , and deformation of boundary density profiles of sheared systems in confinement [13][14][15] . Howon et al studied flow instabilities in inhomogeneous shear with Browninan dynamics simulations 16 .…”

Section: Introductionmentioning

confidence: 99%

Memory-induced motion reversal in Brownian liquids

Treffenstädt

Schmidt

2020

Soft Matter

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We study the Brownian dynamics of hard spheres under spatially inhomogeneous shear, using event-driven Brownian dynamics simulations and power functional theory. We examine density and current profiles both for steady states and for the transient dynamics after switching on and switching off an external square wave shear force field. We find that a dense hard sphere fluid (volume fraction ≈ 0.35) undergoes global motion reversal after switching off the shear force field. We use power functional theory with a spatially nonlocal memory kernel to describe the superadiabatic force contributions and obtain good quantitative agreement of the theoretical results with simulation data. The theory provides an explanation for the motion reversal: Internal superadiabatic nonequilibrium forces that oppose the externally driven current arise due to memory after switching off. The effect is genuinely viscoelastic: in steady state, viscous forces oppose the current, but they elastically generate an opposing current after switch-off.

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Lane formation in a driven attractive fluid

Cited by 39 publications

References 47 publications

Dynamical formation of quantum droplets in a K39 mixture

Dynamical formation of quantum droplets in a K39 mixture

Supersolidity around a Critical Point in Dipolar Bose-Einstein Condensates

Memory-induced motion reversal in Brownian liquids

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