期刊
PHYSICAL REVIEW B
卷 79, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.125125
关键词
high-temperature effects; Hubbard model; lattice theory; metal-insulator transition; phase separation
资金
- Nishina Memorial Foundation
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.
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