{"title":"Superconducting correlations in the asymmetric Hubbard model","authors":"Pavol Farkašovský","doi":"10.1016/j.physc.2025.1354693","DOIUrl":null,"url":null,"abstract":"<div><div>The projector Quantum-Monte-Carlo method is used to examine effects of down-spin electron hopping <span><math><msub><mrow><mi>t</mi></mrow><mrow><mi>↓</mi></mrow></msub></math></span> and the on-site interaction <span><math><mi>U</mi></math></span> 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 <span><math><mi>d</mi></math></span>-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 <span><math><mi>U</mi></math></span> 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.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354693"},"PeriodicalIF":1.3000,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physica C-superconductivity and Its Applications","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921453425000462","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, APPLIED","Score":null,"Total":0}
引用次数: 0
Abstract
The projector Quantum-Monte-Carlo method is used to examine effects of down-spin electron hopping and the on-site interaction 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 -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 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.
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.
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