Unoccupied band dispersion of Si(1 1 1):√3 × √3-Ag surface studied by time- and angle-resolved two-photon photoemission spectroscopy |
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| Authors: | Kazutoshi Takahashi Junpei AzumaMasao Kamada |
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| Institution: | Synchrotron Light Application Center, Saga University, Saga 840-8502, Japan |
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| Abstract: | Band dispersion and transient population of unoccupied electronic states on Si(1 1 1):√3 × √3-Ag surface have been studied by time-resolved (TR) and angle-resolved (AR) two-photon photoemission (2PPE) spectroscopy. The band dispersions originating from unoccupied electronic states have been identified from the comparison between AR-2PPE spectra and angle-resolved one-photon photoemission spectra with synchrotron radiation. A lifetime of unoccupied surface state has been determined from the TR-2PPE spectra. |
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| Keywords: | Two-photon photoemission Surface states Electron dynamics Silicon Silver |
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