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Journal Article

Role of matrix elements in the time-resolved photoemission signal


Michiardi,  M.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Boschini, F., Bugini, D., Zonno, M., Michiardi, M., Day, R. P., Razzoli, E., et al. (2020). Role of matrix elements in the time-resolved photoemission signal. New Journal of Physics, 22: 023031, pp. 1-8. doi:10.1088/1367-2630/ab6eb1.

Cite as: http://hdl.handle.net/21.11116/0000-0006-09EC-7
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. © 2020 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.