Vortex supersolid in the XY model with tunable vortex fugacity

被引:1
作者
Maccari, I [1 ]
Castellani, C. [3 ,4 ]
Defenu, N. [2 ]
Enss, T. [5 ]
机构
[1] Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden
[2] Swiss Fed Inst Technol, Inst Theoret Phys, Wolfgang-Pauli-Str 27, CH-8093 Zurich, Switzerland
[3] Sapienza Univ Rome, Dept Phys, Ple A Moro 2, I-00185 Rome, Italy
[4] Inst Complex Syst ISC CNR, UOS Sapienza, Ple A Moro 5, I-00185 Rome, Italy
[5] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany
基金
瑞士国家科学基金会;
关键词
vortex supersolid; XY model; 2D Coulomb gas; BKT phase transition; 2D vortex-antivortex lattice; PHASE-TRANSITIONS; TEMPERATURE; LATTICE; ORDER; GAS;
D O I
10.1088/1361-648X/acd295
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
In this paper, we investigate the XY model in the presence of an additional potential term that independently tunes the vortex fugacity favouring their nucleation. By increasing the strength of this term and thereby the vortex chemical potential mu, we observe significant changes in the phase diagram with the emergence of a normal vortex-antivortex lattice as well as a superconducting vortex-antivortex crystal (lattice supersolid) phase. We examine the transition lines between these two phases and the conventional non-crystalline one as a function of both the temperature and the chemical potential. Our findings suggest the possibility of a peculiar tricritical point where second-order, first-order, and infinite-order transition lines meet. We discuss the differences between the present phase diagram and previous results for two-dimensional Coulomb gas models. Our study provides important insights into the behaviour of the modified XY model and opens up new possibilities for investigating the underlying physics of unconventional phase transitions.
引用
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页数:7
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