Direct resolution of unoccupied states in solids via two photon photoemission

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

2007-12-17

arxiv.org/abs/0712.2713v1

Physics

Condensed Matter

Other Condensed Matter

12 pages, including 4 figures

Scientific paper

10.1103/PhysRevB.78.155314

Non-linear effects in photoemission are shown to open a new 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 used to demonstrate that such structures are present in low-energy laser spectroscopy experimental measurements on Si previously published. Similar resonances are expected in ultraviolet angle-resolved photoemission spectra, as shown in a model calculation on Al.

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