Photoemission angular distribution beyond the single wavevector description of photoelectron final states
arxiv(2023)
摘要
We develop a simulation procedure for angle-resolved photoemission
spectroscopy (ARPES), where a photoelectron wave function is set to be an
outgoing plane wave in a vacuum associated with the emitted photoelectron wave
packet. ARPES measurements on the transition metal dichalcogenide
1T-TiS_2 are performed, and our simulations exhibit good
agreement with experiments. Analysis of our calculated final state wave
functions quantitatively visualizes that they include various waves due to the
boundary condition and the uneven crystal potential. These results show that a
more detailed investigation of the photoelectron final states is necessary to
fully explain the photon-energy- and light-polarization-dependent ARPES
spectra.
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