Time- and angle-resolved photoemission spectroscopy (TR-ARPES) provides access to the ultrafast evolution of electrons and many-body interactions in solid-state systems. However, the momentum- and energy-resolved transient photoemission intensity may not be unambiguously described by the intrinsic relaxation dynamics of photoexcited electrons alone. The interpretation of the time-dependent photoemission signal can be affected by the transient evolution of the electronic distribution, and both the one-electron removal spectral function as well as the photoemission matrix elements. Here we investigate the topological insulator Bi1.1Sb0.9Te2S to demonstrate, by means of a detailed probe-polarization dependent study, the transient contribution of matrix elements to TR-ARPES.
Boschini, F., Bugini, D., Zonno, M., Michiardi, M., Day, R. P., Razzoli, E., Zwartsenberg, B., Schneider, M., Da Silva Neto, E. H., Dal Conte, S., Kushwaha, S. K., Cava, R. J., Zhdanovich, S., Mills, A. K., Levy, G., Carpene, E., Dallera, C., Giannetti, C., Jones, D. J., Cerullo, G., Damascelli, A., Role of matrix elements in the time-resolved photoemission signal, <<NEW JOURNAL OF PHYSICS>>, 2020; 22 (2): N/A-N/A. [doi:10.1088/1367-2630/ab6eb1] [http://hdl.handle.net/10807/163059]
Role of matrix elements in the time-resolved photoemission signal
Giannetti, Claudio;
2020
Abstract
Time- and angle-resolved photoemission spectroscopy (TR-ARPES) provides access to the ultrafast evolution of electrons and many-body interactions in solid-state systems. However, the momentum- and energy-resolved transient photoemission intensity may not be unambiguously described by the intrinsic relaxation dynamics of photoexcited electrons alone. The interpretation of the time-dependent photoemission signal can be affected by the transient evolution of the electronic distribution, and both the one-electron removal spectral function as well as the photoemission matrix elements. Here we investigate the topological insulator Bi1.1Sb0.9Te2S to demonstrate, by means of a detailed probe-polarization dependent study, the transient contribution of matrix elements to TR-ARPES.
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