Exciton Excitations in a One－Dimensional Band Insulator with Hubbard Interactions

顾波; 娄继忠; 覃绍京; 向涛

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Exciton Excitations in a One－Dimensional Band Insulator with Hubbard Interactions

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摘要

We study the properties of exciton excitations in the Hubbard model with alternating potential and dimerized hopping terms at half filling. With increasing Coulomb repulsive, we find that a spin triplet exciton band develops below the band gap. At certain critical interaction, the excitation gap of this exciton band vanishes and a new phase with a dimerized ground state emerges. The value of this critical Coulomb interaction is determined perturbatively.

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《中国物理快报：英文版》 |2004年第3期|530-533|共4页
作者
顾波; 娄继忠; 覃绍京; 向涛;
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作者单位

DepartmentofPhysics;

PekingUniversity;

Beijing100871;

PHPInstforBioengineeringandBioscience;

GeorgiaInstofTech;

315FerstDrive;

Atlanta;

GA30332-0363;

USA;

InterdisciplinaryCenterofTheoreticalStudies;

ChineseAcademyofSciences;

POBox2735;

Beijing100080;

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原文格式 PDF
正文语种 chi
中图分类绝缘材料、电介质及其制品;
关键词
激子激发; 带状绝缘体; Hubbard相互作用; 带隙; 哈密顿体系; 粒子孔激发; 自旋三重激发态;

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Exciton Excitations in a One－Dimensional Band Insulator with Hubbard Interactions

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