Anomalous Electron Spectrum and Its Relation to Peak Structure of Electron Scattering Rate in Cuprate Superconductors
Anomalous Electron Spectrum and Its Relation to Peak Structure of Electron Scattering Rate in Cuprate Superconductors
复制标题
铜酸盐超导体的反常电子能谱及其与电子散射率峰结构的关系
DOI：
10.1007/s10909-018-1870-y
复制
发表时间：
2018
影响因子：
2
通讯作者：
Feng Shiping
中科院分区：
文献类型：
--
作者：
Gao Deheng;Mou Yingping;Feng Shiping
最近发现的一个直接联系的尖峰之间的铜酸盐超导体的电子准粒子散射率和著名的峰-谷-驼峰结构的电子准粒子激发光谱要求一个解释。在动能驱动的超导机制框架下，研究了铜氧化物超导体电子准粒子激发谱中的复杂线形。结果表明，电子间通过自旋激发交换的相互作用在电子准粒子散射率的波腹区和波节区附近产生一个显著的峰结构。而这种峰结构在热点处消失，导致在波腹区和波节区附近形成明显的峰-谷-峰结构，而在热点处消失。该理论还证实了在铜氧化物超导体的电子准粒子激发谱中观察到的电子准粒子散射率的尖峰是导致显著的峰-谷-峰结构的直接原因。
The recent discovery of a direct link between the sharp peak in the electron quasiparticle scattering rate of cuprate superconductors and the well-known peak–dip–hump structure in the electron quasiparticle excitation spectrum is calling for an explanation. Within the framework of the kinetic-energy-driven superconducting mechanism, the complicated line-shape in the electron quasiparticle excitation spectrum of cuprate superconductors is investigated. It is shownthat the interaction between electrons by the exchange of spin excitations generates a notable peak structure in the electron quasiparticle scattering rate around the antinodal and nodal regions. However, this peak structure disappears at the hot spots, which leads to that the striking peak–dip–hump structure is developed around the antinodal and nodal regions, and vanishes at the hot spots. The theory also confirms that the sharp peak observed in the electron quasiparticle scattering rate is directly responsible for the remarkable peak–dip–hump structure in the electron quasiparticle excitation spectrum of cuprate superconductors.