Energy of the bosonic kinks in the quasiparticle spectrum of cuprate superconductors
Energy of the bosonic kinks in the quasiparticle spectrum of cuprate superconductors
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DOI：
10.1103/physrevb.80.094521
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发表时间：
2009-09
影响因子：
3.7
通讯作者：
E. Schachinger;J. P. Carbotte
中科院分区：
文献类型：
--
作者：
E. Schachinger;J. P. Carbotte
铜酸盐的重正态电子色散曲线中的扭结被广泛地解释为由于玻色散激发的耦合。玻色子能量与扭结位置之间的关系取决于温度、电子系统的状态（超导或正常）以及底层电子-玻色子相互作用谱密度的形状。只有在狄拉克函数谱密度不现实的情况下，扭结能量才对应于玻色子能量加上超导间隙的总和。
Kinks seen in the renormalized electronic dispersion curves of the cuprates have been widely interpreted as due to coupling to bosonic excitations. The relationship between boson energy and the kink position can depend on temperature, the state of the electronic system, superconducting or normal, as well as on the shape of the underlying electron-boson interaction spectral density. Only in the unrealistic case of a Dirac $\ensuremath{\delta}$-function spectral density does the kink energy correspond to the sum of the boson energy plus the superconducting gap.