| Issue |
EPL
Volume 94, Number 2, April 2011
|
|
|---|---|---|
| Article Number | 27005 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/94/27005 | |
| Published online | 18 April 2011 | |
Band-gap enhancement in core-excited metals
Department of Physics, Kyoto University - Sakyo-ku, Kyoto 606-8502, Japan
a
kitamura@scphys.kyoto-u.ac.jp
Received:
20
January
2011
Accepted:
19
March
2011
Through analyses of the density-matrix equations of motion for electrons in metals, we show that the energy band gap is enhanced when many electrons are excited from core to valence bands, indicating a tendency opposite to the band-gap reduction observed in the valence-electron excitation of semiconductors; it is a consequence of inhomogeneous excitation from highly localized core to delocalized valence bands. Such a band-gap enhancement suggests a blue shift of the photoabsorption edge, leading to a possibility of demonstrating saturable absorber switching by means of intense EUV or X-ray free-electron-laser pulses.
PACS: 71.10.-w – Theories and models of many-electron systems / 32.80.Aa – Inner-shell excitation and ionization / 42.65.Re – Ultrafast processes; optical pulse generation and pulse compression
© EPLA, 2011
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