AI 中文总结
研究通过可调亚晶格交错势对掺杂蜂窝 Hubbard 模型配对对称性的影响，采用量子蒙特卡罗方法计算相关量，发现低掺杂时交错势使配对趋势转变，高掺杂时\(d + id\)波主导，还明确在位相互作用作用，为超导设计提供工具和灵感。
AI 中文摘要
控制超导配对对称性对设计非常规和拓扑超导体至关重要，但除化学掺杂外的实际调谐参数有限。本研究探讨了可调亚晶格交错势对掺杂蜂窝 Hubbard 模型中配对对称性的影响。采用有限温度下的行列式量子蒙特卡罗和零温度下的约束路径量子蒙特卡罗来计算不同通道的自旋磁化率和配对关联。发现增加交错势会抑制反铁磁涨落，在低掺杂时主导配对趋势从\(d + id\)波转变为\(f_n\)波，两种量子蒙特卡罗方法结果一致。在高掺杂水平下，即使交错势增强，系统仍由\(d + id\)波配对主导。此外，增强在位相互作用\(U\)会增强主导配对通道。结果表明交错势是无需改变掺杂浓度就能选择非常规配对对称性的实用能带工程工具，为设计基于石墨烯的人工超导体及相关掺杂带绝缘体提供了灵感。
英文摘要
The ability to control superconducting pairing symmetry is crucial for designing unconventional and topological superconductors, yet practical tuning parameters beyond chemical doping remain limited. In this study, we investigate the effect of a tunable sublattice staggered potential on the pairing symmetry in the doped honeycomb Hubbard model. Determinant quantum Monte Carlo at finite temperature and constrained-path quantum Monte Carlo at zero temperature are employed to compute spin susceptibilities and pairing correlations in different channels. We find that increasing the staggered potential suppresses antiferromagnetic fluctuations and, at low doping, induces a transition in the dominant pairing tendency from $d+id$-wave to $f_n$-wave, with consistent results from both quantum Monte Carlo methods. In contrast, at higher doping levels, the system remains dominated by $d+id$-wave pairing even under an enhanced staggered potential. Moreover, strengthening the on-site interaction $U$ enhances the dominant pairing channel, underscoring the essential role of electronic correlations. Our results establish the staggered potential as a practical band-engineering tool for selecting unconventional pairing symmetries without varying the doping concentration, providing inspiration for designing graphene-based artificial superconductors and related doped band insulators such as Li${}_x$MNCl.
Comments9 pages and 11 figures. Accepted for publication in Phys. Rev. B
Journal refPhys. Rev. B 114, 115102 (2026)
