Janus effect of inter-orbital hybridization on correlation strength of strongly correlated systems: A dynamical mean-field study

doi:10.1088/1674-1056/adf040

中国物理B ›› 2026, Vol. 35 ›› Issue (2): 27103-027103.doi: 10.1088/1674-1056/adf040

Janus effect of inter-orbital hybridization on correlation strength of strongly correlated systems: A dynamical mean-field study

Jian Sun(孙健)^1,†, Yinchang Zhao(赵银昌)², and Chao Lian(廉超)³

1 School of Mathematics, Physics, and Statistics, Shanghai Polytechnic University, Shanghai 201209, China;
2 Department of Physics, Yantai University, Yantai 264005, China;
3 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2025-03-31 修回日期:2025-07-14 接受日期:2025-07-16 发布日期:2026-01-31
通讯作者: Jian Sun E-mail:sunjian@sspu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 12174327) and the Natural Science Foundation of Shandong Province, China (Grant No. ZR2023ZD09).

Janus effect of inter-orbital hybridization on correlation strength of strongly correlated systems: A dynamical mean-field study

Jian Sun(孙健)^1,†, Yinchang Zhao(赵银昌)², and Chao Lian(廉超)³

1 School of Mathematics, Physics, and Statistics, Shanghai Polytechnic University, Shanghai 201209, China;
2 Department of Physics, Yantai University, Yantai 264005, China;
3 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2025-03-31 Revised:2025-07-14 Accepted:2025-07-16 Published:2026-01-31
Contact: Jian Sun E-mail:sunjian@sspu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 12174327) and the Natural Science Foundation of Shandong Province, China (Grant No. ZR2023ZD09).

摘要/Abstract

摘要： In multi-orbital systems, the correlation strength is typically attributed to Coulomb interactions and Hund's couplings. However, this study demonstrates that on-site inter-orbital hybridization can also significant influence the correlation strength of the system. We investigate the impact of on-site inter-orbital hybridization on the correlation strength of a two-orbital Hubbard model on a square lattice using the dynamical mean-field theory combined with Lanczos exact diagonalization. Our findings reveal a distinct Janus effect: on-site inter-orbital hybridization enhances correlation strength in the non-half-filled regime while suppresses it at half-filling. This dual role of on-site inter-orbital hybridization provides a fundamental mechanism for tuning the strength of correlations in multi-orbital systems.

关键词: strongly correlated multi-orbital system, inter-orbital hybridization, dynamical mean-field theory

Abstract: In multi-orbital systems, the correlation strength is typically attributed to Coulomb interactions and Hund's couplings. However, this study demonstrates that on-site inter-orbital hybridization can also significant influence the correlation strength of the system. We investigate the impact of on-site inter-orbital hybridization on the correlation strength of a two-orbital Hubbard model on a square lattice using the dynamical mean-field theory combined with Lanczos exact diagonalization. Our findings reveal a distinct Janus effect: on-site inter-orbital hybridization enhances correlation strength in the non-half-filled regime while suppresses it at half-filling. This dual role of on-site inter-orbital hybridization provides a fundamental mechanism for tuning the strength of correlations in multi-orbital systems.

Key words: strongly correlated multi-orbital system, inter-orbital hybridization, dynamical mean-field theory

中图分类号: (Strongly correlated electron systems; heavy fermions)

71.27.+a

71.30.+h (Metal-insulator transitions and other electronic transitions) 71.10.Fd (Lattice fermion models (Hubbard model, etc.))

Jian Sun(孙健), Yinchang Zhao(赵银昌), and Chao Lian(廉超). Janus effect of inter-orbital hybridization on correlation strength of strongly correlated systems: A dynamical mean-field study[J]. 中国物理B, 2026, 35(2): 27103-027103.

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Janus effect of inter-orbital hybridization on correlation strength of strongly correlated systems: A dynamical mean-field study

Janus effect of inter-orbital hybridization on correlation strength of strongly correlated systems: A dynamical mean-field study

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