Density dependence of the dynamical processes governing the velocity autocorrelation function of a quantum fluid
| Autor: | Martin Neumann, Eleonora Guarini, Stefano Bellissima, Ubaldo Bafile, Daniele Colognesi |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Quantum fluid
Physics Uncertainty principle Qunatum fluid Molecular dynamics Kinetic energy hydrogen Autocorrelation Classical fluids 01 natural sciences 010305 fluids & plasmas Exponential function Critical point (thermodynamics) 0103 physical sciences Statistical physics 010306 general physics Quantum |
| Zdroj: | Physical review. E info:cnr-pdr/source/autori:Eleonora Guarini (1), Martin Neumann (2), Stefano Bellissima (3), Daniele Colognesi (3), Ubaldo Bafile (3)/titolo:Density dependence of the dynamical processes governing the velocity autocorrelation function of a quantum fluid/doi:10.1103%2FPhysRevE.100.062111/rivista:Physical review. E (Print)/anno:2019/pagina_da:062111/pagina_a:/intervallo_pagine:062111/volume:100 |
| DOI: | 10.1103/PhysRevE.100.062111 |
| Popis: | We present an exponential mode analysis of the dynamical processes determining the time behavior of the Kubo velocity autocorrelation function (KVAF) of fluid para-${\mathrm{H}}_{2}$, as obtained by ring polymer molecular dynamics simulations at various fluid densities. The mechanisms contributing to the decay of the KVAF are thoroughly characterized at a slightly supercritical temperature, in a density interval ranging from the critical point to the fluid-solid transition. We show that the quantum nature of the system does not influence the specific phenomena and decay channels through which a loss in velocity correlation takes place, since these are the same as found in classical fluids. Similarly, a dynamical crossover is observed with increasing density, signaling the onset of a transverse-like dynamics like in classical systems. We also investigate the effect of density on the processes contributing to the most relevant property of a quantum fluid, namely, the large values of the total and zero-point kinetic energy arising through the Heisenberg uncertainty principle. |
| Databáze: | OpenAIRE |
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