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Collective Excitations around Charge Ordered States and Coexistent States with Different Orders

 

作者: Michiyasu Mori,   Kenji Yonemitsu,  

 

期刊: Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals  （Taylor Available online 2000）
卷期: Volume 343, issue 1  

页码: 221-226

 

ISSN:1058-725X

 

年代: 2000

 

DOI:10.1080/10587250008023530

 

出版商: Taylor & Francis Group

 

关键词: charge ordering;linear excitation;intersite Coulomb repulsion;Hartree-Fock approximation;random phase approximation

 

数据来源: Taylor

 

摘要:

We study qualitative differences of excited states between a charge ordered state and a charge uniforn state. The excited states are calculated in the random phase approximation for the one-dimensional extended Hubbard model at quarter filling. In the charge ordered state, a dominant excitation in the current-current correlation function has no charge density modulation. A dominant excitation in the charge uniform state originates from crossing the dimerization gap and modulates the charge density.

 

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