Tagged particle dynamics in supercooled quantum liquids

Das, A and Krishnan, G and Rabani, E and Harbola, U (2022) Tagged particle dynamics in supercooled quantum liquids. In: Physical Review E, 105 (5).

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Abstract

We analyze the dynamics of quantum supercooled liquids in terms of tagged particle dynamics. Unlike the classical case, uncertainty in the position of a particle in quantum liquid leads to qualitative changes. We demonstrate these effects in the dynamics of the first two moments of displacements, namely, the mean-squared displacement, (?r2(t)), and (?r4(t)). Results are presented for a hard-sphere liquid using mode-coupling theory formulation and simulation on a binary Lennard-Jones liquid. As the quantumness (controlled by the de Broglie thermal wavelength) is increased, a nonzero value of the moments at zero time leads to significant deviations from the classical behavior in the initial dynamics. Initial displacement shows ballistic behavior (?r2(t))~t2, but, as a result of large uncertainty in the position, the dynamical effects become weaker with increasing quantumness over this timescale. © 2022 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review E
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to the American Physical Society.
Keywords:	Cryogenic liquids; Particle dynamics; Quantum theory, A-particles; Hard spheres; Liquid lead; Mean squared displacement; Particle dynamics; Qualitative changes; Quantum liquids; Supercooled liquids; Tagged particle; Uncertainty, Supercooling
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	21 Jun 2022 09:36
Last Modified:	21 Jun 2022 09:36
URI:	https://eprints.iisc.ac.in/id/eprint/73920

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