FERROELECTRIC PHASE-TRANSITIONS IN A MOLECULAR-LIKE ARRAY OF QUANTUM DOTS

被引：9

作者：

GOVOROV, AO

CHAPLIK, AV

机构：

[1] Inst. of Semicond. Phys., Acad. of Sci., Novosibirsk

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1994年 / 6卷 / 32期

关键词：

D O I：

10.1088/0953-8984/6/32/012

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A model of a 'molecular' 2D crystal of quantum dots is considered. Each elementary cell contains two dots connected by tunnelling. Such an array of two-level quantum systems with strongly non-linear polarizability demonstrates the ferroelectric (antiferroelectric) phase transitions due to Coulomb interaction. We find the energy of the ground state, spontaneous moment and phase transition temperature in the self-consistent field approximation. Optical manifestations of the phase transitions in the far-infrared absorption are also investigated.

引用

页码：6507 / 6514

页数：8