Role of matrix elements in the time-resolved photoemission signal

Abstract

Time- and angle-resolved photoemission spectroscopy accesses the ultrafast evolution of quasiparticles and many-body interactions in solid-state systems. However, the momentum- and energy-resolved transient photoemission intensity may not be unambiguously related to the intrinsic relaxation dynamics of photoexcited electrons. In fact, interpretation of the time-dependent photoemission signal can be affected by the transient evolution of both the one-electron removal spectral function as well as the photoemission dipole matrix elements. Here we investigate the topological insulator Bi${}_{1.1}$Sb${}_{0.9}$Te${}_2$S to demonstrate, by means of a careful probe-polarization study, the transient contribution of matrix elements to the time-resolved photoemission signal.

arXiv comment7 pages, 3 figures

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• Establishing non-thermal regimes in pump-probe electron-relaxation dynamics
• Time-resolved ARPES on cuprates: Tracking the low-energy electrodynamics in the time domain
• The electronic structure of intertwined kagome, honeycomb, and triangular sublattices of the intermetallics MCo${}_2$Al${}_9$
• Identification of metastable lattice distortion free charge density wave at photoinduced interface via TRARPES
• Non-equilibrium States and Interactions in the Topological Insulator and Topological Crystalline Insulator Phases of NaCd4As3
• Spinor ice correlation in flat-band electronic states on kagome and pyrochlore lattices with spin-orbit coupling
• Excited-state band structure mapping