Cooperative Phenomena in Systems of Restricted Dimensionality

受限维系统中的合作现象

• 批准号: 9302882
• 负责人: Sebastian Doniach
• 金额: $ 17.7万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-05-01 至 1996-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9302882&HistoricalAwards=false
• 关键词: Cooperative; Phenomena; Systems; Restricted; Dimensionality

Theoretical research will be conducted on two general areas of modern condensed matter physics: the electronic structure of correlated electron systems and the nature of the superconductor- insulator transition in the cuprate superconductors. In the first area, studies will be performed on the influence of oxygen-hole copper-hole pairing on the d-wave superconductivity in the cuprates. As temperature is lowered below the transition temperature there is the possibility of a second phase transition signaling the onset of copper-oxygen pairing. Also to be studied is the nature of the electron pairing in potassium fulleride and the possibility of a special, Berry phase, electron-phonon interaction in the fullerenes. In the second area, studies will be performed on the possibility that the superconductor-insulator transition which occurs with zinc doping in the cuprates represents a simultaneous localization of Cooper pairs and partial de-pairing induced by disorder and/or magnetic fluctuations. In a related but separate study, the effects of incipient boson localization on the quantum tunneling of vortices when the system is close to a field-induced superconductor-insulator transition will be investigated. %%% Theoretical research will be conducted on fundamental problems in condensed matter physics which can have a major impact on understanding the behavior of the high temperature superconductors. The research will primarily focus on the copper-oxide based superconductors. Work will be done on the nature of the transition as the material goes from a superconducting state to an insulating state.

理论研究将在两个一般领域进行， 现代凝聚态物理学： 相关电子系统和超导体的性质 铜氧化物超导体中的绝缘体转变。 在第一个领域，将研究 氧-空穴-铜-空穴配对对d波超导性的影响 铜酸盐 当温度低于转变温度时， 温度存在第二相变的可能性 发出铜氧配对开始的信号。 还有待研究 是富勒烯化钾中电子配对的性质， 一个特殊的，贝里相位，电子声子的可能性 富勒烯中的相互作用 在第二个领域，将研究 锌的超导体-绝缘体转变 在铜酸盐中的掺杂代表了 由无序和/或非有序诱导的库珀对和部分去配对 磁场波动 在一项相关但独立的研究中， 初始玻色子局域化对量子隧穿的影响 当系统接近场诱导时， 将研究超导体-绝缘体转变。 %%% 将对基本问题进行理论研究， 凝聚态物理学， 了解高温超导体的行为。 该研究将主要集中在氧化铜基 超导体 将就过渡的性质开展工作 当材料从超导状态转变为绝缘状态时 状态