Charge dynamics in the Mott insulating phase of the ionic Hubbard model

被引：22

作者：

Aligia, AA ^{[1
]}

机构：

[1] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[2] Comis Nacl Energia Atom, Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.69.041101

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

I extend to charge and bond operators the transformation that maps the ionic Hubbard model at half filling onto an effective spin Hamiltonian. Using the transformed operators I calculate the amplitude of the charge-density wave in different dimensions D. In one dimension, the charge-charge correlations at large distance d decay as d(-3) ln(-3/2)d, in spite of the finite charge gap, due to remaining charge-spin coupling. Bond-bond correlations decay as (-1)(d)d(-1) ln(-3/2)d as in the usual Hubbard model.

引用

页数：4

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