Dresden 2026 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 47: Statistical Physics: General I
DY 47.4: Talk
Thursday, March 12, 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