Polaron crossover and bipolaronic metal-insulator transition in the half-filled Holstein model

被引：95

作者：

Capone, M ^{[1
]}

Ciuchi, S

机构：

[1] Enrico Fermi Ctr, Rome, Italy

[2] Univ Aquila, Ist Nazl Fis Mat, I-67010 Coppito, Italy

[3] Univ Aquila, Dipartimento Fis, I-67010 Coppito, Italy

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.91.186405

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The formation of a finite-density polaronic state is analyzed in the context of the Holstein model using the dynamical mean-field theory. The spinless and spinful fermion cases are compared to disentangle the polaron crossover from the bipolaron formation. The exact solution of dynamical mean-field theory is compared with weak-coupling perturbation theory, noncrossing (Migdal), and vertex correction approximations. We show that polaron formation is not associated with a metal-insulator transition, which is instead due to bipolaron formation.

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页码：186405 / 186405

页数：4

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