Ultrafast Electron Dynamics Dominated by Electron–Phonon Coupling in CrSBr Revealed by Photoemission Electron Microscopy
Layered semiconductor CrSBr has drawn much attention due to its two-dimensional magnetic orders and strong multiphysics couplings. Herein, the electron dynamics of CrSBr (few layers to tens of nanometers) is investigated by time-resolved photoemission electron microscopy with various photoexciting conditions. The valence electrons around the Γ point are considered to be excited along the Γ-Y direction and scattered with phonons along the nearly flat conduction band in the Γ-X direction. The relaxation lifetime of photoelectrons decreases from ∼11 ps at 100 K to ∼2 ps at room temperature, presenting strong electron–phonon coupling in CrSBr. The lifetime is also found to be independent of pump polarization, which implies that the excited-state electrons follow the identical relaxation channel, although CrSBr possesses great anisotropy.
Authors
- Chengyin Wu (ORCID: https://orcid.org/0000-0001-5733-6427)
- Yaolong Li (ORCID: https://orcid.org/0000-0002-1457-190X)
- Pengzuo Jiang (ORCID: https://orcid.org/0000-0002-6359-3195)
- Xiaoyong Hu (ORCID: https://orcid.org/0000-0002-1545-1491)
- Hong Yang (ORCID: https://orcid.org/0000-0003-4647-1388)
- Xiaying Lyu
- Yunan Gao (ORCID: https://orcid.org/0000-0002-3131-7559)
- Qihuang Gong (ORCID: https://orcid.org/0000-0003-4974-6244)
- Zuxin Chen (ORCID: https://orcid.org/0009-0000-7450-0620)
- Yang Wang (ORCID: https://orcid.org/0009-0001-2456-4252)
- Yu Liu (ORCID: https://orcid.org/0000-0001-7251-2310)
- Xiaofang Li (ORCID: https://orcid.org/0000-0002-0604-849X)
- Yu Ye (ORCID: https://orcid.org/0000-0001-6046-063X)
- Linfeng Zhang (ORCID: https://orcid.org/0000-0003-4773-2279)
- Jinglin Tang
- Jingying Xiao
- Tingting Wang (ORCID: https://orcid.org/0009-0008-5948-0594)
Institutions
- King University (US)
- Shanxi University (CN)
- South China Normal University (CN)
- Peking University (CN)
- Collaborative Innovation Center of Quantum Matter (CN)
- Shanxi University of Traditional Chinese Medicine (CN)
Publication Details
- Journal
- The Journal of Physical Chemistry C
- Published
- 2024-12-12
- DOI
- https://doi.org/10.1021/acs.jpcc.4c07231
- Citations
- 5
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.59
Funders
- National Natural Science Foundation of China
- National Key Research and Development Program of China
- Basic and Applied Basic Research Foundation of Guangdong Province