CHARGE-TRANSFER POLARONS AND EXCITONS
文献类型：期刊论文
| 作者 | LORENZANA, J; YU, L ; LORENZANA, J , SCUOLA INT SUPER STUDI AVANZATI,STRADA COSTIERA 11,I-34014 TRIESTE,ITALY.
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| 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 |
| ISSN号 | 0163-1829 |
| 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. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:A1991FL04100097 |
| 公开日期 | 2012-08-28 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/11313]  |
| 专题 | 理论物理研究所_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. |
| 推荐引用方式 GB/T 7714 | 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. |
入库方式： OAI收割
来源：理论物理研究所
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