非对称哈伯德模型中的超导相关性

IF 1.3 3区物理与天体物理 Q4 PHYSICS, APPLIED

Physica C-superconductivity and Its Applications Pub Date : 2025-03-18 DOI:10.1016/j.physc.2025.1354693

Pavol Farkašovský

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引用次数: 0

摘要

利用投影量子-蒙特卡罗方法研究了二维非对称Hubbard模型中下自旋电子跳变t↓和上下自旋电子之间的场相互作用U对超导相关的影响。结果表明，下自旋电子跳变和现场相互作用都强烈地增强了d波通道中的超导相关性。在半填充带附近的电子浓度下，下自旋电子跳变对超导相关性的增强最为显著，此外，对角线电荷条纹与超导相关性之间的强联系被观察到，并且不断增加的现场相互作用U进一步增强了这种效应。在轴向条纹相中也观察到超导相关性的增强，而在分离相中可以忽略不计。这为理解强相关电子系统中非均匀电荷有序与超导性之间的关系开辟了新的途径。

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Superconducting correlations in the asymmetric Hubbard model

The projector Quantum-Monte-Carlo method is used to examine effects of down-spin electron hopping

t_{↓}

and the on-site interaction

U

between the up and down spin electrons on superconducting correlations in the two-dimensional asymmetric Hubbard model. It is shown that both, the down-spin electron hopping, as well as the on-site interaction strongly enhance the superconducting correlations in the

d

-wave channel. The most significant enhancement of superconducting correlations, by down-spin electron hopping, is found for electron concentrations near the half-filled band case where, in addition, the strong connection between the diagonal charge stripes and the superconducting correlations is observed and the increasing on-site interaction

U

further enhances this effect. The enhancement of superconducting correlations is observed also in the axial striped phase, while it is negligible in the segregated phase. This opens new route to understanding the relation between the inhomogeneous charge ordering and superconductivity in strongly correlated electron systems.

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来源期刊

Physica C-superconductivity and Its Applications 物理-物理：应用

CiteScore

2.70

自引率

11.80%

发文量

102

审稿时长

66 days

期刊介绍： Physica C (Superconductivity and its Applications) publishes peer-reviewed papers on novel developments in the field of superconductivity. Topics include discovery of new superconducting materials and elucidation of their mechanisms, physics of vortex matter, enhancement of critical properties of superconductors, identification of novel properties and processing methods that improve their performance and promote new routes to applications of superconductivity. The main goal of the journal is to publish: 1. Papers that substantially increase the understanding of the fundamental aspects and mechanisms of superconductivity and vortex matter through theoretical and experimental methods. 2. Papers that report on novel physical properties and processing of materials that substantially enhance their critical performance. 3. Papers that promote new or improved routes to applications of superconductivity and/or superconducting materials, and proof-of-concept novel proto-type superconducting devices. The editors of the journal will select papers that are well written and based on thorough research that provide truly novel insights.