The intriguing electronic properties of two-dimensional materials motivates experiments to resolve their rapid, microscopic interactions and dynamics across momentum space. Essential insight into the electronic momentum-space dynamics can be obtained directly via time- and angle-resolved photoemission spectroscopy (trARPES). We discuss the development of a high-repetition rate trARPES setup that employs a bright source of narrowband, extreme-UV harmonics around 22.3 eV, and its application to sensitive studies of materials dynamics. In the bulk transition-metal dichalcogenide MoSe2 momentum-space quasiparticle scattering is observed after resonant excitation at the K-point exciton line, resulting in the time-delayed buildup of electrons at the Σ-point conduction band minimum. We will discuss this and other aspects of the non-equilibrium electronic response accessible with the extreme-UV trARPES probe.
Jan Heye Buss, Julian Maklar, Frédéric Joucken, He Wang, Yiming Xu, Sung-Kwan Mo, Alessandra Lanzara, and Robert A. Kaindl, "Ultrafast extreme-ultraviolet ARPES studies of electronic dynamics in two-dimensional materials," Proc. SPIE 10102, Ultrafast Phenomena and Nanophotonics XXI, 101020I (Presented at SPIE OPTO: January 31, 2017; Published: 23 February 2017); https://doi.org/10.1117/12.2251249.
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