Three-step melting of hard superdisks in two dimensions

Gurin, Péter and Varga, Szabolcs and Odriozola, Gerardo (2020) Three-step melting of hard superdisks in two dimensions. PHYSICAL REVIEW E: COVERING STATISTICAL NONLINEAR BIOLOGICAL AND SOFT MATTER PHYSICS (2016-), 102 (6). ISSN 2470-0045


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We explore the link between the melting scenarios of two-dimensional systems of hard disks and squares through replica-exchange Monte Carlo simulations of hard superdisks. The well-known melting scenarios are observed in the disk and square limits, while we observe an unusual three-step scenario for dual-shapes. We find that two mesophases mediate the melting: a hexatic phase and another fluid phase with a D 2 local symmetry, we call it rhombatic, where both bond and particle orientational orders are quasi-long-range. Our results show that not only can the melting process of liquid-crystal forming molecules be complicated, where elongated shapes stabilize several mesophases, but also that of anisotropic quasispherical molecules.

Item Type: Article
Uncontrolled Keywords: 2D Melting, Mesophases, Monte Carlo simulations, Superdisks phase diagram
Subjects: Q Science / természettudomány > QC Physics / fizika > QC03 Heat. Thermodinamics / hőtan, termodinamika
Q Science / természettudomány > QC Physics / fizika > QC06 Physics of condensed matter / szilárdtestfizika
Q Science / természettudomány > QD Chemistry / kémia > QD02 Physical chemistry / fizikai kémia
Depositing User: Professor Dezső Boda
Date Deposited: 09 Nov 2023 13:01
Last Modified: 09 Nov 2023 13:01

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