Collective modes and gapped momentum states in liquid Ga: Experiment, theory, and simulation

Khusnutdinoff, R. M.; Cockrell, Cillian; Dicks, Oliver A.; Jensen, Anders C. S.; Le, Manh Duc; Wang, Ling; Dove, Martin T.; Мокшин, А. В.; Бражкин, В. В.; Trachenko, Kostya

doi:10.1103/physrevb.101.214312

Cited by 32 publications

(46 citation statements)

References 38 publications

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“…Frenkel, 1 and recently demonstrated by Trachenko and co-workers. 33,34 Following the analytical steps presented in Ref., 35 we arrive at the following expression for the frequency-dependent storage modulus G ,…”

Section: Introductionmentioning

confidence: 99%

Universal G′ ∼ L^–3 Law for the Low-Frequency Shear Modulus of Confined Liquids

Zaccone

Noirez

2021

J. Phys. Chem. Lett.

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Liquids confined to sub-millimeter scales have remained poorly understood. One of the most striking effects is the large elasticity revealed using good wetting conditions, which grows upon further decreasing the confinement length, L. These systems display a low-frequency shear modulus in the order of 1–103 Pa, contrary to our everyday experience of liquids as bodies with a zero low-frequency shear modulus. While early experimental evidence of this effect was met with skepticism and abandoned, further experimental results and, most recently, a new atomistic theoretical framework have confirmed that liquids indeed possess a finite low-frequency shear modulus G′, which scales with the inverse cubic power of confinement length L. We show that this law is universal and valid for a wide range of materials (liquid water, glycerol, ionic liquids, non-entangled polymer liquids, isotropic liquids crystals). Open questions and potential applications in microfluidics mechanochemistry, energy, and other fields are highlighted.

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Section: Introductionmentioning

confidence: 99%

Universal G′ ∼ L^–3 Law for the Low-Frequency Shear Modulus of Confined Liquids

Zaccone

Noirez

2021

J. Phys. Chem. Lett.

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“…In the context of phonon-like modes, this has been observed in [33,34]. Such phenomena of breakdown of hydrodynamics due to collision between a hydrodynamic and a quasi-hydrodynamic mode at a real and parametrically small value of momentum leading to a k-gap is a characteristic property of the collective modes of liquids [35]. In fact, our model interpolates between various qualitatively different behaviors about which we will have more to say in the following subsection.…”

Section: Jhep11(2021)080mentioning

confidence: 63%

“…This results in the system having low energy propagating modes for momentum k > k c where k c is close to zero for small inter-system coupling. This feature is quite ubiquitous in dissipative systems with a softly broken symmetry and is called the k-gap [32,35]. Additionally, our system has a third pole which also moves from negative imaginary infinity along the negative imaginary axis with increasing momentum and produces an instability as it crosses the origin.…”

Section: Discussionmentioning

confidence: 90%

Quasinormal modes of a semi-holographic black brane and thermalization

Mondkar

Mukhopadhyay

Rebhan

et al. 2021

J. High Energ. Phys.

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We study the quasinormal modes and non-linear dynamics of a simplified model of semi-holography, which consistently integrates mutually interacting perturbative and strongly coupled holographic degrees of freedom such that the full system has a total conserved energy. We show that the thermalization of the full system can be parametrically slow when the mutual coupling is weak. For typical homogeneous initial states, we find that initially energy is transferred from the black brane to the perturbative sector, later giving way to complete transfer of energy to the black brane at a slow and constant rate, while the entropy grows monotonically for all time. Larger mutual coupling between the two sectors leads to larger extraction of energy from the black brane by the boundary perturbative system, but also quicker irreversible transfer of energy back to the black brane. The quasinormal modes replicate features of a dissipative system with a softly broken symmetry including the so-called k-gap. Furthermore, when the mutual coupling is below a critical value, there exists a hybrid zero mode with finite momentum which becomes unstable at higher values of momentum, indicating a Gregory-Laflamme type instability. This could imply turbulent equipartitioning of energy between the boundary and the holographic degrees of freedom in the presence of inhomogeneities.

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“…This data is lower than the value 25.79 meV Å ' 3921 m/s provided by electron gas-based calculations with the exact local-field correction [89], which, contrary to Hg, indicates a non-negligible ion plasma contribution. Further investigations revealed complex features [178] in the collective excitation spectra, similarly to the case of mercury, indicating deviations from the simple models with just one longitudinal acoustic mode. These deviations, though apparently quantitatively small, are nonetheless the fingerprints of the complex nature of the interactions, which require more sophisticated models to describe the experimental data.…”

Section: Gallium the Unsolved Excess Of Signalmentioning

confidence: 87%

“…The previous analysis of the spectra was based on a single DHO plus a quasi-elastic peak and the finding was found that the temperature increase produced a minor effect only. However, it is important to note that, although the single-mode model is statistically adequate, the raw data contain indication of more complex features existing, as also suggested by the more recent neutron-scattering experiment of Ref [178].…”

Section: Gallium the Unsolved Excess Of Signalmentioning

confidence: 93%

Future applications of the high-flux thermal neutron spectroscopy: the ever-green case of collective excitations in liquid metals

Petrillo

Sacchetti

2021

Advances in Physics: X

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The European landscape of neutron sources for research applications is changing and the major European joint effort, the European Spallation Source (ESS) currently under construction in Lund (Sweden), is progressing. The high flux source ESS is designed to deliver slow neutrons with a longpulse time structure, a rather unique feature, with characteristics optimised to maximise the instrument performances and the experimental throughput. This is expected to result in unprecedented scientific capability over broad research areas. Major breakthroughs are likely to take place in the understanding of complex, strongly interacting and disordered systems, more specifically on their dynamical response. This will have an impact on the development of novel theories to cover some of the presently existing knowledge gaps and will prompt advanced applications of the investigated materials. Liquid metals are a prototypical example of complex systems extensively studied from the sixties on, now re-emerging as powerful functional materials for unconventional and broad spectrum applications. Research on liquid metal composites will benefit of the new experimental possibilities available at the ESS. We review the status of the experiments on liquid metals dynamics, focusing on a selected set of systems, and discuss the perspectives for cutting-edge experiments at the new sources.

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Collective modes and gapped momentum states in liquid Ga: Experiment, theory, and simulation

Cited by 32 publications

References 38 publications

Universal G′ ∼ L^–3 Law for the Low-Frequency Shear Modulus of Confined Liquids

Universal G′ ∼ L^–3 Law for the Low-Frequency Shear Modulus of Confined Liquids

Quasinormal modes of a semi-holographic black brane and thermalization

Future applications of the high-flux thermal neutron spectroscopy: the ever-green case of collective excitations in liquid metals

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Collective modes and gapped momentum states in liquid Ga: Experiment, theory, and simulation

Cited by 32 publications

References 38 publications

Universal G′ ∼ L–3 Law for the Low-Frequency Shear Modulus of Confined Liquids

Universal G′ ∼ L–3 Law for the Low-Frequency Shear Modulus of Confined Liquids

Quasinormal modes of a semi-holographic black brane and thermalization

Future applications of the high-flux thermal neutron spectroscopy: the ever-green case of collective excitations in liquid metals

Contact Info

Product

Resources

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Universal G′ ∼ L^–3 Law for the Low-Frequency Shear Modulus of Confined Liquids

Universal G′ ∼ L^–3 Law for the Low-Frequency Shear Modulus of Confined Liquids