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arXiv 1801.00701cond-mat.str-el
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温度对三带p-d-Holstein模型极化子激发态电子结构的影响

Temperature effect on the electronic structure of the polaronic excitations within the three-band p-d-Holstein model

Ilya A. Makarov, Sergey G. Ovchinnikov

摘要:

本文在p-d-Holstein三带模型框架下,采用极化子形式的广义紧束缚(GTB)方法,研究了具有强电子关联和强电子-声子相互作用的铜氧化物体系的电子结构与温度的关系.在这种方法中,电子结构是由极化准粒子构成的初始和最终极化多电子态之间的激发。温度效应通过局域激发极化子态的占据数和自旋-自旋关联函数大小的变化来考虑。温度升高导致价带顶的光谱函数峰展宽、峰位移动、峰强度降低。

英文摘要:

In this work we investigate temperature dependence of electronic structure of system with strong electronic correlations and strong electron-phonon interaction modeling cuprates in the frameworks of the three-band p-d-Holstein model by a polaronic version of the generalized tight binding (GTB) method. Within this approach the electronic structure is formed by polaronic quasiparticles constructed as excitations between initial and final polaronic multielectron states. Temperature effect is taken into account by occupation numbers of local excited polaronic states and variations in the magnitude of spin-spin correlation functions. Temperature increasing leads to broadening of the spectral function peak at the top of the valence band, shift of the peak, the decreasing of the peak intensity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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