Intermediate coupling theory of electronic ferroelectricity

被引：72

作者：

Batista, CD ^{[1
]}

Gubernatis, JE

Bonca, J

Lin, HQ

机构：

[1] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA

[2] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[3] Univ Ljubljana, FMF, Dept Phys, Ljubljana, Slovenia

[4] Jozef Stefan Inst, Ljubljana, Slovenia

[5] Chinese Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.92.187601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We calculate the quantum phase diagram of an extended Falicov-Kimball model for one- and two-dimensional systems in the intermediate coupling regime. Even though some features of the phase diagram are obtained analytically, the main results are calculated with a constrained path Monte Carlo technique. We find that this regime is dominated by a Bose-Einstein condensation of excitons with a built-in electric polarization. The inclusion of a finite hybridization between the bands removes the condensate but reinforces the ferroelectricity.

引用

页码：187601 / 1

页数：4

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