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arXiv 2304.03034cond-mat.str-el
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Mott-Hubbard系统中双空穴或双占据子之间的吸引与排斥

Attraction versus repulsion between doublons or holons in Mott-Hubbard systems

Friedemann Queisser, Gernot Schaller, Ralf Schützhold

AI总结:

该研究针对强耦合极限下Fermi-Hubbard模型的Mott绝缘体态,通过三种方法对比发现双占据子与空穴子的有效相互作用在跃迁强度线性阶下随动量呈现吸引或排斥特性,并探讨了其对高温超导的意义。

摘要:

针对强耦合极限下Fermi-Hubbard模型的Mott绝缘体态,我们研究了双占据子(doublons)和空穴子(holons)形式的准粒子之间的相互作用。通过对比关联层级法、强耦合微扰理论以及Hubbard四聚体的精确解析解这三种不同方法,我们发现双占据子和/或空穴子之间的有效相互作用在跃迁强度$T$的线性阶下,根据所涉及的动量不同,可同时呈现吸引和排斥分量。最后,我们推测了这些发现对高温超导的潜在意义。

英文摘要:

For the Mott insulator state of the Fermi-Hubbard model in the strong-coupling limit, we study the interaction between quasi-particles in the form of doublons and holons. Comparing different methods -- the hierarchy of correlations, strong-coupling perturbation theory, and exact analytic solutions for the Hubbard tetramer -- we find an effective interaction between doublons and/or holons to linear order in the hopping strength $T$ which can display attractive as well as repulsive contributions, depending on the involved momenta. Finally, we speculate about the implications of our findings for high-temperature superconductivity.

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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