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Direct resolution of unoccupied states in solids via two-photon photoemission

AuthorsSchattke, W.; Krasovskii, E. E.; Díez Muiño, Ricardo ; Echenique, Pedro M.
Issue Date2008
PublisherAmerican Physical Society
CitationPhysical Review B 78(15): 155314 (2008)
AbstractNonlinear effects in photoemission are shown to open an access to the band structure of unoccupied states in solids, totally different from hitherto used photoemission spectroscopy. Despite its second-order nature, strong resonant transitions occur, obeying exact selection rules of energy, crystal symmetry, and momentum. Ab initio calculations are performed to demonstrate that such structures are present in low-energy laser spectroscopy experimental measurements on Si. Similar resonances are predicted in ultraviolet angle-resolved photoemission spectra, as shown with a theoretical calculation on bulk Al. © 2008 The American Physical Society.
Identifiersdoi: 10.1103/PhysRevB.78.155314
issn: 1098-0121
e-issn: 1550-235X
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