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

被引：93
|
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.
引用
收藏
页码：186405 / 186405
页数：4
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