Full Phase Diagram of Active Brownian Disks: From Melting to Motility-Induced Phase Separation

被引：272

作者：

Digregorio, Pasquale ^{[1
,2
]}

Levis, Demian ^{[3
,4
]}

Suma, Antonio ^{[5
,6
]}

Cugliandolo, Leticia F. ^{[7
]}

Gonnella, Giuseppe ^{[1
,2
]}

Pagonabarraga, Ignacio ^{[3
,4
]}

机构：

[1] Univ Bari, Dipartmento Fis, Via Amendola 173, I-70126 Bari, Italy

[2] INFN, Sez Bari, Via Amendola 173, I-70126 Bari, Italy

[3] Ecole Polytech Fed Lausanne, CECAM, Batochim, Ave Forel 2, CH-1015 Lausanne, Switzerland

[4] UBICS, Marti i Franques 1, E-08028 Barcelona, Spain

[5] SISSA, Via Bonomea 265, I-34136 Trieste, Italy

[6] Temple Univ, Inst Computat Mol Sci, Philadelphia, PA 19122 USA

[7] Sorbonne Univ, CNRS, UMR 7589, Lab Phys Theor & Hautes Energy, 4 Pl Jussieu, F-75252 Paris 05, France

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 121卷 / 09期

基金：

欧盟地平线“2020”;

关键词：

EQUATION-OF-STATE; 2; DIMENSIONS; TRANSITION; ORDER; METASTABILITY; PARTICLES; PRESSURE; BEHAVIOR; SYSTEMS;

D O I：

10.1103/PhysRevLett.121.098003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We establish the complete phase diagram of self-propelled hard disks in two spatial dimensions from the analysis of the equation of state and the statistics of local order parameters. The equilibrium melting scenario is maintained at small activities, with coexistence between active liquid and hexatic order, followed by a proper hexatic phase, and a further transition to an active solid. As activity increases, the emergence of hexatic and solid order is shifted towards higher densities. Above a critical activity and for a certain range of packing fractions, the system undergoes motility-induced phase separation and demixes into low and high density phases; the latter can be either disordered (liquid) or ordered (hexatic or solid) depending on the activity.

引用

页数：5

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