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arXiv 1507.04837cond-mat.str-el
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扩展哈伯德模型中对称单周期光脉冲引起的相位分离

Phase Separation Induced by Symmetric Monocycle Optical Pulse in Extended Hubbard Models

Hiroki Yanagiya, Yasuhiro Tanaka, Kenji Yonemitsu

摘要:

在规则晶格上的一维和二维半填充扩展哈伯德模型中,研究了对称单周期大幅度电场脉冲诱导的多电子动力学。无二聚化)使用精确对角化方法的小系统和Hartree-Fock近似的大系统。负温度态的形成和从排斥相互作用到有效的吸引相互作用的变化被证明是实现了一个广泛的区域的场振幅和激发能。对于不可忽略的位间排斥作用,数值结果与富电荷区和贫电荷区之间的相分离是由相应的有效吸引力引起的这一事实是一致的。

英文摘要:

Many-electron dynamics induced by a symmetric monocycle electric-field pulse of large amplitude is theoretically investigated in one- and two-dimensional half-filled extended Hubbard models on regular lattices (i.e., without dimerization) using the exact diagonalization method for small systems and the Hartree-Fock approximation for large systems. The formation of a negative-temperature state and the change from repulsive interactions to effective attractive interactions are shown to be realized for a wide region of the field amplitude and the excitation energy. For a nonnegligible intersite repulsive interaction, the numerical results are consistent with the fact that the phase separation between charge-rich and charge-poor regions is caused by the corresponding effective 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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