| SPECIAL TOPIC — Exciton Physics: Fundamentals, materials and devices |
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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 |
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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.
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Received: 07 September 2025
Revised: 21 November 2025
Accepted manuscript online: 04 December 2025
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PACS:
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71.27.+a
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(Strongly correlated electron systems; heavy fermions)
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71.10.Fd
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(Lattice fermion models (Hubbard model, etc.))
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78.47.J-
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(Ultrafast spectroscopy (<1 psec))
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| Fund: 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). |
Corresponding Authors:
Can Shao
E-mail: shaocan@njust.edu.cn
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Cite this article:
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 2026 Chin. Phys. B 35 057104
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