Finite-temperature semimetal-insulator transition on the honeycomb lattice

被引：31

作者：

Tran, Minh-Tien ^{[1
,2
]}

Kuroki, Kazuhiko ^{[3
]}

机构：

[1] Vietnamese Acad Sci & Technol, Inst Phys, Hanoi 10000, Vietnam

[2] POSTECH, Asia Pacific Ctr Theoret Phys, Pohang 790784, Gyeongbuk, South Korea

[3] Univ Electron Commun, Dept Appl Phys & Chem, Tokyo 1828585, Japan

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 12期

关键词：

high-temperature effects; Hubbard model; lattice theory; metal-insulator transition; phase separation; MOTT-HUBBARD TRANSITION; INFINITE DIMENSIONS; MODEL; SUPERCONDUCTIVITY; BEHAVIOR; FERMIONS; SYSTEMS;

D O I：

10.1103/PhysRevB.79.125125

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A semimetal-insulator transition in the Hubbard model on the honeycomb lattice is studied by using the dynamical mean-field theory. Electrons in the honeycomb lattice resemble the Dirac electron liquid and for weak interactions the system is semimetal. With increasing the local interaction, a semimetal-insulator transition occurs. We find a nonanalytical structure of the phase transition which consists of a first-order transition line ending in a second-order transition point and high-temperature crossover line. A phase separation of semimetal and insulator occurs at low temperatures. Maxwell construction is performed to determine the first-order transition line. The phase diagram is also presented.

引用

页数：6