Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session A16: Control of Noisy Non-Linear Dynamical Systems
8:00 AM–11:00 AM,
Monday, March 15, 2021
Sponsoring
Units:
GSNP DBIO
Chair: Uwe Tauber, Virginia Tech
Abstract: A16.00002 : Phase Diagram and Interfacial Instabilities in the Driven Widom-Rowlinson Lattice Gas*
8:12 AM–8:24 AM
Live
Presenter:
Ronald Dickman
(Univ Fed de Minas Gerais)
Authors:
Ronald Dickman
(Univ Fed de Minas Gerais)
Royce Zia
(Center for Soft Matter and Biological Physics, Virginia Tech and Physics Department, University of Houston)
Maxim Lavrentovich
(Department of Physics and Astronomy, University of Tennessee)
Hugues Chate
(CEA-Saclay, France, and Beijing CSRC, China)
separation above a critical density and, under a drive, remarkable
properties such as lamellar ordering perpendicular to the drive, and kink
singularities in the structure factor [1]. Initial studies of the high-density
ordered phase were complicated by artifacts of the initial configuration.
These are now eliminated using a new method in which particles are slowly
added to the evolving system, allowing a pattern of the preferred wavelength
to emerge spontaneously. This method enables detailed study of the sequence
of transitions between stripe numbers with increasing system size at fixed
drive and density, and precise mapping of the boundary between disordered
and ordered phases as reflected in the order parameter and the density of
interfacial sites. We also analyze the instability of an interface oriented
along the drive, characterized by an exponential-growth regime in the amplitude
of interface undulations and systematic increase of the dominant wavelength.
These undulations eventually connect via the periodic boundaries, yielding stripes
oriented perpendicular to the drive.
1. R. Dickman and R.K.P. Zia, Phys Rev. E 97, 062126 (2018).
*CNPq, Brazil
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