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DY: Fachverband Dynamik und Statistische Physik

DY 47: Statistical Physics: General I

DY 47.4: Vortrag

Donnerstag, 12. März 2026, 10:15–10:30, ZEU/0114

Emergence of mixed orientational ordering in quasi-one-dimensional superdisk and superball fluids — •Sakineh Mizani¹, Martin Oettel¹, Péter Gurin², and Szabolcs Varga² — ¹Institute for Applied Physics, University of Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany — ²Physics Department, Centre for Natural Sciences, University of Pannonia, PO Box 158, Veszprém, H-8201 Hungary

We investigate the collective behavior of hard anisotropic particles confined in quasi-one-dimensional channels where particle centers are constrained to a line but particles can rotate freely. For superdisks and superballs with tunable curvature, equilibrium properties are calculated using an exact transfer-operator method. We reveal the emergence of a novel state of mixed orientational order which is characterized by a close-packing state with particles having two distinct orientations, distributed randomly over the line [1]. This ordering is highly sensitive to particle shape: small deviations from ideal spherical symmetry can stabilize or destabilize the mixed phase, demonstrating the the subtle interplay between particle geometry and confinement. Our results provide new insights into entropically driven ordering in confined systems, offering potential guidelines for designing colloidal assemblies and understanding phase behavior in narrow channels. [1] S. Mizani et al, arXiv:2510.06918, J. Mol. Liq. (accepted).

Keywords: quasi-one-dimensional -systems; anisotropic particles; orientational ordering