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arXiv 1507.04828cond-mat.str-elcond-mat.supr-con
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掺杂莫特绝缘体引起的单粒子能谱态

States induced in the single-particle spectrum by doping a Mott insulator

Masanori Kohno

摘要:

在强关联电子系统中,在莫特绝缘体掺杂后,单粒子谱中莫特能隙中的态的出现是一个显著的特征,不能用传统的刚性能带图来解释。本文通过对量子数和相关态重叠的分析,以及用梯形和双层t-J模型的论证,表明在空穴掺杂引起的连续Mott跃迁中,莫特绝缘体的磁激发态通常出现在电子中,在下Hubbard带未被完全充满的动量区,色散关系被费米动量移动。这意味着电子加成谱中的类自由电子模的色散关系最终转变为莫特绝缘体的动量移动磁色散关系,而其谱权向莫特跃迁方向逐渐消失。这个特征反映了莫特绝缘体的自旋-电荷分离。

英文摘要:

In strongly correlated electron systems, the emergence of states in the Mott gap in the single-particle spectrum following the doping of the Mott insulator is a remarkable feature that cannot be explained in a conventional rigid-band picture. Here, based on an analysis of the quantum numbers and the overlaps of relevant states, as well as through a demonstration using the ladder and bilayer t-J models, it is shown that in a continuous Mott transition due to hole doping, the magnetically excited states of the Mott insulator generally emerge in the electron-addition spectrum with the dispersion relation shifted by the Fermi momentum in the momentum region where the lower Hubbard band is not completely filled. This implies that the dispersion relation of a free-electron-like mode in the electron-addition spectrum eventually transforms into essentially the momentum-shifted magnetic dispersion relation of the Mott insulator, while its spectral weight gradually disappears toward the Mott transition. This feature reflects the spin-charge separation of the Mott insulator.

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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