Raman光谱中的动态Jahn-Teller效应和超导激发
Dynamic Jahn-Teller effect and superconducting excitations in Raman spectra
摘要：
我们报告了一个模型研究的声子响应的相互作用的超导（SC）的差距和静态和动态的Jahn-Teller（JT）扭曲和预测的外观的SC和Jahn-Teller（JT）扭曲间隙激发峰的拉曼光谱中的高温超导体。该模型由包含导带中静态JT相互作用和s波型SC相互作用的哈密顿量组成。此外，声子耦合到带中的传导电子的密度以及JT分裂导带，从而产生动态Jahn-Teller（DJT）相互作用。声子被认为是在一个谐波近似。用Zubarev方法计算了声子格林函数，并计算了正常电子-声子（EP）相互作用和DJT相互作用引起的声子自能。由此产生的声子自能由两个序参量共存相的电子响应密度函数计算。声子谱密度预测两个激发峰，一个是由于SC间隙和其他由于JT失真。DJT耦合抑制了JT带隙，同时提高了SC带隙和SC转变温度。这些激发峰的演变进行了研究，通过改变不同的模型参数的系统。
英文摘要：
We report a model study of the phonon response on the interplay of the superconducting (SC) gap and both static and dynamic Jahn-Teller distortion and predict the appearance of the SC and Jahn-Teller (JT) distortion gap excitation peaks in the Raman spectra of high-Tc superconductors. The model consists of the Hamiltonian containing static JT interaction and s-wave type SC interaction in the conduction band. Further the phonons are coupled to the density of the conduction electron in the band as well as to the JT split conduction band giving rise to dynamic Jahn-Teller (DJT) interaction. The phonons are considered in a harmonic approximation. The phonon Green's function is calculated by Zubarev's technique and the phonon self-energy arising due to normal electron-phonon (EP) interaction and DJT interaction. The phonon self-energy arising due to this is calculated from the electron response density function in the coexistence phase of the two order parameters. The phonon spectral density predicts two excitation peaks, one due to SC gap and the other due to JT distortion. The DJT coupling suppresses the JT gap while it enhances SC gap as well as SC transition temperature. The evolution of these excitation peaks are investigated by varying different model parameters of the system.
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