Universität zu Köln

Mandal, Suvendu, Schrack, Lukas, Loewen, Hartmut, Sperl, Matthias and Franosch, Thomas (2019). Persistent Anti-Correlations in Brownian Dynamics Simulations of Dense Colloidal Suspensions Revealed by Noise Suppression. Phys. Rev. Lett., 123 (16). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

Transport properties of a hard-sphere colloidal fluid are investigated by Brownian dynamics simulations. We implement a novel algorithm for the time-dependent velocity-autocorrelation function (VACF) essentially eliminating the noise of the bare random motion. The measured VACF reveals persistent anti-correlations manifested by a negative algebraic power-law tail t(-5/2) at all densities. At small packing fractions the simulations fully agree with the analytic low-density prediction, yet the amplitude of the tail becomes dramatically suppressed as the packing fraction is increased. The mode-coupling theory of the glass transition provides a qualitative explanation for the strong variation in terms of the static compressibility as well as the slowing down of the structural relaxation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mandal, Suvendu UNSPECIFIED UNSPECIFIED UNSPECIFIED Schrack, Lukas UNSPECIFIED UNSPECIFIED UNSPECIFIED Loewen, Hartmut UNSPECIFIED UNSPECIFIED UNSPECIFIED Sperl, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Franosch, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-130901
DOI:	10.1103/PhysRevLett.123.168001
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	123
Number:	16
Date:	2019
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MODE-COUPLING THEORY; SELF-DIFFUSION; SCATTERING FUNCTION; MEMORY FUNCTION; TRANSITION; FLUCTUATIONS; PARTICLES; MOTION Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13090