Mott transition in degenerate Hubbard models: Application to doped fullerenes

被引：133

作者：

Gunnarsson, O ^{[1
]}

Koch, E ^{[1
]}

Martin, RM ^{[1
]}

机构：

[1] UNIV ILLINOIS, DEPT PHYS, URBANA, IL 61801 USA

来源：

PHYSICAL REVIEW B | 1996年 / 54卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.54.R11026

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Mott-Hubbard transition is studied for a Hubbard model with orbital degeneracy N, using a diffusion Monte Carlo method. Based on general arguments, we conjecture that the Mott-Hubbard transition takes place for U/W similar to root N, where U is the Coulomb interaction and W is the bandwidth. This is supported by exact-diagonalization and Monte Carlo calculations. Realistic parameters for the doped fullerenes lead to the conclusions that stoichiometric A(3)C(60) (A=K, Rb) are near the Mott-Hubbard transition, in a correlated metallic state.

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页码：11026 / 11029

页数：4

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