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arXiv 1102.0837cond-mat.str-el
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二维扩展Falicov-Kimball模型中的激子共振

Excitonic resonances in the 2D extended Falicov-Kimball model

Van-Nham Phan, Holger Fehske, Klaus W. Becker

摘要:

使用基于投影的重整化方法,我们调查的激子绝缘体相的形成在二维(2D)无自旋Falicov-Kimball模型与色散$f$电子和地址激子束缚态的存在在高温下的半导体侧的半金属-半导体转变。为此,我们计算的虚部的动态电子-空穴对的磁化率和分析的波矢和能量依赖的激子共振出现在带隙中。因此,我们确认存在的激子绝缘体和激子环境内的一个通用的双带晶格模型与当地库仑吸引力。

英文摘要:

Using the projector-based renormalization method we investigate the formation of the excitonic insulator phase in the two-dimensional (2D) spinless Falicov-Kimball model with dispersive $f$ electrons and address the existence of excitonic bound states at high temperatures on the semiconductor side of the semimetal-semiconductor transition. To this end we calculate the imaginary part of the dynamical electron-hole pair susceptibility and analyze the wave-vector and energy dependence of excitonic resonances emerging in the band gap. We thereby confirm the existence of the exciton insulator and its exciton environment within a generic two-band lattice model with local Coulomb attraction.

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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