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CHARGE-TRANSFER POLARONS AND EXCITONS
LORENZANA, J; YU, L; LORENZANA, J , SCUOLA INT SUPER STUDI AVANZATI,STRADA COSTIERA 11,I-34014 TRIESTE,ITALY.
1991
发表期刊PHYSICAL REVIEW B
ISSN0163-1829
卷号43期号:13页码:11474-11477
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.
部门归属INT CTR THEORET PHYS,I-34014 TRIESTE,ITALY; CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA
关键词High-tc Superconductors Cuprate Superconductors Optical-excitations Oxygen Deficiency Spectra States Photoemission Yba2cu3o7-x Absorption Smba2cu3o6
学科领域Physics
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收录类别SCI
WOS记录号WOS:A1991FL04100097
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被引频次:11[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/11313
专题理论物理所1978-2010年知识产出
通讯作者LORENZANA, J , SCUOLA INT SUPER STUDI AVANZATI,STRADA COSTIERA 11,I-34014 TRIESTE,ITALY.
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LORENZANA, J,YU, L,LORENZANA, J , SCUOLA INT SUPER STUDI AVANZATI,STRADA COSTIERA 11,I-34014 TRIESTE,ITALY.. CHARGE-TRANSFER POLARONS AND EXCITONS[J]. PHYSICAL REVIEW B,1991,43(13):11474-11477.
APA LORENZANA, J,YU, L,&LORENZANA, J , SCUOLA INT SUPER STUDI AVANZATI,STRADA COSTIERA 11,I-34014 TRIESTE,ITALY..(1991).CHARGE-TRANSFER POLARONS AND EXCITONS.PHYSICAL REVIEW B,43(13),11474-11477.
MLA LORENZANA, J,et al."CHARGE-TRANSFER POLARONS AND EXCITONS".PHYSICAL REVIEW B 43.13(1991):11474-11477.
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