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题名: CHARGE-TRANSFER POLARONS AND EXCITONS
作者: LORENZANA, J ;  YU, L
刊名: PHYSICAL REVIEW B
出版日期: 1991
卷号: 43, 期号:13, 页码:11474-11477
关键词: HIGH-TC SUPERCONDUCTORS ;  CUPRATE SUPERCONDUCTORS ;  OPTICAL-EXCITATIONS ;  OXYGEN DEFICIENCY ;  SPECTRA ;  STATES ;  PHOTOEMISSION ;  YBA2CU3O7-X ;  ABSORPTION ;  SMBA2CU3O6
学科分类: Physics
通讯作者: LORENZANA, J , SCUOLA INT SUPER STUDI AVANZATI,STRADA COSTIERA 11,I-34014 TRIESTE,ITALY.
部门归属: INT CTR THEORET PHYS,I-34014 TRIESTE,ITALY; CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA
英文摘要: We show that polarons and excitons of charge-transfer origin arise quite naturally in the p-d model of high-temperature superconductors. We consider the limit in which on-site Coulomb repulsion on both Cu and O is taken to be infinite and treat the Cu-O repulsion U(pd) in the Hartree-Fock approximation. We find that the uniform Hartree-Fock solution is unstable (the compressibility is negative) for small enough doping. Using an unrestricted Hartree-Fock scheme we find in one dimension (1D) that one particle added to the half-filled case forms a self-trapped polaron state of charge-transfer origin. We also find that there is no phase separation. Within the same formalism we subsequently study exciton states. In 2D we obtain similar compressibility results, suggesting that the ground state is also polaronic. Our results are also relevant for one-dimensional charge-transfer systems.
收录类别: SCI
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/11313
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
LORENZANA, J,YU, L. CHARGE-TRANSFER POLARONS AND EXCITONS[J]. PHYSICAL REVIEW B,1991,43(13):11474-11477.
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