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キーワード:
matrix-elements, time- and angle-resolved photoemission spectroscopy (TR-ARPES), topological insulators, ultrafast electron dynamics, Antimony compounds, Bismuth compounds, Electric insulators, Photoelectron spectroscopy, Tellurium compounds, Topological insulators, Angle resolved photoemission spectroscopy, Electronic distribution, Many-body interactions, Matrix elements, Photoemission intensity, Photoexcited electrons, Time-resolved photoemissions, Ultrafast electron dynamics, Electrons
要旨:
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.
