Photoexcitation of the one-dimensional extended Peierls-Hubbard model at quarter-filling

doi:10.1088/1674-1056/ae27af

中国物理B ›› 2026, Vol. 35 ›› Issue (5): 57104-057104.doi: 10.1088/1674-1056/ae27af

• • 上一篇

Photoexcitation of the one-dimensional extended Peierls-Hubbard model at quarter-filling

Yu-Peng Li(李昱澎)^1,†, Yu-Chang Liu(刘羽畅)^1,†, Yu-Zhuo Zhao(赵玉卓)^1,†, Hantao Lu(陆汉涛)^2,3, and Can Shao(邵灿)^1,‡

1 Department of Applied Physics & MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing 210094, China;
2 School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;
3 Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, Key Laboratory of Quantum Theory and Applications of MoE, Gansu Provincial Research Center for Basic Disciplines of Quantum Physics, Lanzhou University, Lanzhou 730000, China

收稿日期:2025-09-07 修回日期:2025-11-21 接受日期:2025-12-04 发布日期:2026-04-24
通讯作者: Can Shao E-mail:shaocan@njust.edu.cn
基金资助:
We thank H.-Q. Lin, T. Tohyama and L. Du for helpful discussions. C. S. and H. L. acknowledge supports from the National Natural Science Foundation of China (Grant No. 12247101), the Fundamental Research Funds for the Central Universities (Grant No. lzujbky-2025-jdzx07), the Natural Science Foundation of Gansu Province (Grant No. 25JRRA799), and the ‘111 Center’ (Grant No. B20063). H. L. acknowledges support from the National Natural Science Foundation of China (Grants No. 12174168).

Photoexcitation of the one-dimensional extended Peierls-Hubbard model at quarter-filling

Yu-Peng Li(李昱澎)^1,†, Yu-Chang Liu(刘羽畅)^1,†, Yu-Zhuo Zhao(赵玉卓)^1,†, Hantao Lu(陆汉涛)^2,3, and Can Shao(邵灿)^1,‡

1 Department of Applied Physics & MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing 210094, China;
2 School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;
3 Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, Key Laboratory of Quantum Theory and Applications of MoE, Gansu Provincial Research Center for Basic Disciplines of Quantum Physics, Lanzhou University, Lanzhou 730000, China

Received:2025-09-07 Revised:2025-11-21 Accepted:2025-12-04 Published:2026-04-24
Contact: Can Shao E-mail:shaocan@njust.edu.cn
Supported by:
We thank H.-Q. Lin, T. Tohyama and L. Du for helpful discussions. C. S. and H. L. acknowledge supports from the National Natural Science Foundation of China (Grant No. 12247101), the Fundamental Research Funds for the Central Universities (Grant No. lzujbky-2025-jdzx07), the Natural Science Foundation of Gansu Province (Grant No. 25JRRA799), and the ‘111 Center’ (Grant No. B20063). H. L. acknowledges support from the National Natural Science Foundation of China (Grants No. 12174168).

摘要/Abstract

摘要： Utilizing the time-dependent Lanczos method, we investigate the photoexcitation dynamics of the one-dimensional (1D) extended Peierls–Hubbard model at quarter filling. In equilibrium, it is well established that introducing the nearest-neighbour interaction V into the 1D Peierls–Hubbard model can lead to the formation of Mott–Hubbard excitons, which exhibit a characteristic frequency in the optical conductivity that is lower than the Mott gap. Ultrafast photoexcitation of this model gives rise to a transient metallic state for V < 2, characterized by several features, including a zero-frequency Drude peak in the post-pump optical conductivity, an increase in the density of charge carriers, and enhanced electron hopping between dimers. In contrast, when V ≥ 2, this metallic state is no longer observed, as photoinduced carriers bind to form excitons, thereby inhibiting metallic behavior. These results highlight a parallel between the optical excitation of the 1D extended Peierls–Hubbard model at quarter filling and that of the 1D extended Hubbard model at half filling, suggesting a universal mechanism governing their photoinduced responses.

关键词: strongly correlated electron systems, extended Peierls-Hubbard model, ultrafast dynamics

Abstract: Utilizing the time-dependent Lanczos method, we investigate the photoexcitation dynamics of the one-dimensional (1D) extended Peierls–Hubbard model at quarter filling. In equilibrium, it is well established that introducing the nearest-neighbour interaction V into the 1D Peierls–Hubbard model can lead to the formation of Mott–Hubbard excitons, which exhibit a characteristic frequency in the optical conductivity that is lower than the Mott gap. Ultrafast photoexcitation of this model gives rise to a transient metallic state for V < 2, characterized by several features, including a zero-frequency Drude peak in the post-pump optical conductivity, an increase in the density of charge carriers, and enhanced electron hopping between dimers. In contrast, when V ≥ 2, this metallic state is no longer observed, as photoinduced carriers bind to form excitons, thereby inhibiting metallic behavior. These results highlight a parallel between the optical excitation of the 1D extended Peierls–Hubbard model at quarter filling and that of the 1D extended Hubbard model at half filling, suggesting a universal mechanism governing their photoinduced responses.

Key words: strongly correlated electron systems, extended Peierls-Hubbard model, ultrafast dynamics

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

71.27.+a

71.10.Fd (Lattice fermion models (Hubbard model, etc.)) 78.47.J- (Ultrafast spectroscopy (<1 psec))

Yu-Peng Li(李昱澎), Yu-Chang Liu(刘羽畅), Yu-Zhuo Zhao(赵玉卓), Hantao Lu(陆汉涛), and Can Shao(邵灿). Photoexcitation of the one-dimensional extended Peierls-Hubbard model at quarter-filling[J]. 中国物理B, 2026, 35(5): 57104-057104.

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Photoexcitation of the one-dimensional extended Peierls-Hubbard model at quarter-filling

Photoexcitation of the one-dimensional extended Peierls-Hubbard model at quarter-filling

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