中国物理B ›› 2024, Vol. 33 ›› Issue (3): 38703-038703.doi: 10.1088/1674-1056/ad174a

所属专题: SPECIAL TOPIC — States and new effects in nonequilibrium

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Ultrafast photoemission electron microscopy: A multidimensional probe of nonequilibrium physics

Yanan Dai(戴亚南)1,2,†   

  1. 1 Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China;
    2 Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen 518045, China
  • 收稿日期:2023-10-11 修回日期:2023-12-19 接受日期:2023-12-20 出版日期:2024-02-22 发布日期:2024-02-22
  • 通讯作者: Yanan Dai E-mail:daiyn@sustech.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 12374223) and Shenzhen Science and Technology Program (Grant No. 20231117151322001).

Ultrafast photoemission electron microscopy: A multidimensional probe of nonequilibrium physics

Yanan Dai(戴亚南)1,2,†   

  1. 1 Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China;
    2 Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen 518045, China
  • Received:2023-10-11 Revised:2023-12-19 Accepted:2023-12-20 Online:2024-02-22 Published:2024-02-22
  • Contact: Yanan Dai E-mail:daiyn@sustech.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 12374223) and Shenzhen Science and Technology Program (Grant No. 20231117151322001).

摘要: Exploring the realms of physics that extend beyond thermal equilibrium has emerged as a crucial branch of condensed matter physics research. It aims to unravel the intricate processes involving the excitations, interactions, and annihilations of quasi- and many-body particles, and ultimately to achieve the manipulation and engineering of exotic non-equilibrium quantum phases on the ultrasmall and ultrafast spatiotemporal scales. Given the inherent complexities arising from many-body dynamics, it therefore seeks a technique that has efficient and diverse detection degrees of freedom to study the underlying physics. By combining high-power femtosecond lasers with real- or momentum-space photoemission electron microscopy (PEEM), imaging excited state phenomena from multiple perspectives, including time, real space, energy, momentum, and spin, can be conveniently achieved, making it a unique technique in studying physics out of equilibrium. In this context, we overview the working principle and technical advances of the PEEM apparatus and the related laser systems, and survey key excited-state phenomena probed through this surface-sensitive methodology, including the ultrafast dynamics of electrons, excitons, plasmons, spins, etc., in materials ranging from bulk and nano-structured metals and semiconductors to low-dimensional quantum materials. Through this review, one can further envision that time-resolved PEEM will open new avenues for investigating a variety of classical and quantum phenomena in a multidimensional parameter space, offering unprecedented and comprehensive insights into important questions in the field of condensed matter physics.

关键词: ultrafast photoemission electron microscopy, ultrafast momentum microscopy, excited state physics

Abstract: Exploring the realms of physics that extend beyond thermal equilibrium has emerged as a crucial branch of condensed matter physics research. It aims to unravel the intricate processes involving the excitations, interactions, and annihilations of quasi- and many-body particles, and ultimately to achieve the manipulation and engineering of exotic non-equilibrium quantum phases on the ultrasmall and ultrafast spatiotemporal scales. Given the inherent complexities arising from many-body dynamics, it therefore seeks a technique that has efficient and diverse detection degrees of freedom to study the underlying physics. By combining high-power femtosecond lasers with real- or momentum-space photoemission electron microscopy (PEEM), imaging excited state phenomena from multiple perspectives, including time, real space, energy, momentum, and spin, can be conveniently achieved, making it a unique technique in studying physics out of equilibrium. In this context, we overview the working principle and technical advances of the PEEM apparatus and the related laser systems, and survey key excited-state phenomena probed through this surface-sensitive methodology, including the ultrafast dynamics of electrons, excitons, plasmons, spins, etc., in materials ranging from bulk and nano-structured metals and semiconductors to low-dimensional quantum materials. Through this review, one can further envision that time-resolved PEEM will open new avenues for investigating a variety of classical and quantum phenomena in a multidimensional parameter space, offering unprecedented and comprehensive insights into important questions in the field of condensed matter physics.

Key words: ultrafast photoemission electron microscopy, ultrafast momentum microscopy, excited state physics

中图分类号:  (Ultrafast dynamics; charge transfer)

  • 87.15.ht
78.47.da (Excited states) 68.37.Xy (Scanning Auger microscopy, photoelectron microscopy) 79.60.-i (Photoemission and photoelectron spectra)