Onset of transverse (shear) waves in strongly-coupled Yukawa fluids

Khrapak, S. A.; Khrapak, A. G.; Kryuchkov, Nikita P.; Yurchenko, Stanislav O.

doi:10.1063/1.5088141

Cited by 45 publications

(32 citation statements)

References 144 publications

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“…A k-gap dispersion relation for plasmons in type II Dirac semimetals has been suggested in [85] and it is possibly measurable. Similar results have also been discussed and experimentally observed in the transverse spectrum of Yukawa fluids [86,87]. Our results can clearly be of help in this direction.…”

Section: Discussionsupporting

confidence: 90%

Holographic plasmon relaxation with and without broken translations

Baggioli

Gran

Alba

et al. 2019

J. High Energ. Phys.

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We study the dynamics and the relaxation of bulk plasmons in strongly coupled and quantum critical systems using the holographic framework. We analyze the dispersion relation of the plasmonic modes in detail for an illustrative class of holographic bottom-up models. Comparing to a simple hydrodynamic formula, we entangle the complicated interplay between the three least damped modes and shed light on the underlying physical processes. Such as the dependence of the plasma frequency and the effective relaxation time in terms of the electromagnetic coupling, the charge and the temperature of the system. Introducing momentum dissipation, we then identify its additional contribution to the damping. Finally, we consider the spontaneous symmetry breaking (SSB) of translational invariance. As the strength of SSB is increased, we observe a transition between dressed zero sound, the plasmon, and the normal sound controlled by the elastic moduli and the propagation of longitudinal phonons. This crossover is characterized by the disappearance of the plasma frequency gap in the sound mode.

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Section: Discussionsupporting

confidence: 90%

Holographic plasmon relaxation with and without broken translations

Baggioli

Gran

Alba

et al. 2019

J. High Energ. Phys.

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“…In this second case, we add momentum relaxation to our initial plasma by coupling it to a scalar sector. Momentum relaxation will make the plasma "dirty" and closer to the realistic situation in dusty plasma, as in [20][21][22]. The relaxation of momentum produces a finite damping for the shear mode, whose dispersion relation now becomes:…”

Section: A Dirty Plasma With Coulomb Interactionsmentioning

confidence: 99%

Transverse collective modes in interacting holographic plasmas

Baggioli

Gran

Tornsö

2020

J. High Energ. Phys.

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We study in detail the transverse collective modes of simple holographic models in presence of electromagnetic Coulomb interactions. We render the Maxwell gauge field dynamical via mixed boundary conditions, corresponding to a double trace deformation in the boundary field theory. We consider three different situations: (i) a holographic plasma with conserved momentum, (ii) a holographic (dirty) plasma with finite momentum relaxation and (iii) a holographic viscoelastic plasma with propagating transverse phonons. We observe two interesting new features induced by the Coulomb interactions: a mode repulsion between the shear mode and the photon mode at finite momentum relaxation, and a propagation-todiffusion crossover of the transverse collective modes induced by the finite electromagnetic interactions. Finally, at large charge density, our results are in agreement with the transverse collective mode spectrum of a charged Fermi liquid for strong interaction between quasiparticles, but with an important difference: the gapped photon mode is damped even at zero momentum. This property, usually referred to as anomalous attenuation, is produced by the interaction with a quantum critical continuum of states and might be experimentally observable in strongly correlated materials close to quantum criticality, e.g. in strange metals.

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“…70,71 Locating k * for various simple fluids in different parameter regimes and investigating k-gap consequences on the liquid state properties is an active area of research. [72][73][74][75][76] For our present purpose it is important that the inclination of the dispersion curve ∂ω t /∂k near the onset of the transverse mode at k > k * can be well approximated by c t . Thus, the latter is a meaningful quantity both in solid and strongly coupled fluid states.…”

Section: Sound Velocities In Different Spatial Dimensionsmentioning

confidence: 99%

Unified description of sound velocities in strongly coupled Yukawa systems of different spatial dimensionality

Khrapak

2019

Physics of Plasmas

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Sound velocities in classical single-component fluids with Yukawa (screened Coulomb) interactions are systematically evaluated and analyzed in one-, two-, and three spatial dimensions (D = 1, 2, 3). In the strongly coupled regime the convenient sound velocity scale is given by Q 2 /∆m, where Q is the particle charge, m is the particle mass, n is the particle density, and ∆ = n −1/D is the unified interparticle distance. The sound velocity can be expressed as a product of this scaling factor and a dimension-dependent function of the screening parameter, κ = ∆/λ, where λ is the screening length. A unified approach is used to derive explicit expressions for these dimension-dependent functions in the weakly screened regime (κ 3). It is also demonstrated that for stronger screening (κ 3), the effect of spatial dimensionality virtually disappears, the longitudinal sound velocities approach a common asymptote, and a one-dimensional nearest-neighbor approximation provides a relatively good estimate for this asymptote. This result is not specific to the Yukawa potential, but equally applies to other classical systems with steep repulsive interactions. An emerging relation to a popular simple freezing indicator is briefly discussed. Overall, the results can be useful when Yukawa interactions are relevant, in particular, in the context of complex (dusty) plasmas and colloidal suspensions.

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Onset of transverse (shear) waves in strongly-coupled Yukawa fluids

Cited by 45 publications

References 144 publications

Holographic plasmon relaxation with and without broken translations

Holographic plasmon relaxation with and without broken translations

Transverse collective modes in interacting holographic plasmas

Unified description of sound velocities in strongly coupled Yukawa systems of different spatial dimensionality

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