Abstract
We identify direct-transition photoemission peaks from the bulk valence bands of Si in energy- and momentum-resolved photoemission from Si(111)-(7×7) using polarized 6-eV laser light. Time-resolved study of spectral line shapes of the peaks under interband excitation by 2-eV femtosecond-laser pulses shows the ultrafast transient spectral-width broadening and its recovery associated with a low-energy peak shift. The changes reveal the dynamics of screening effects by electron-hole plasma, hot-hole relaxation, and band renormalization in photoexcited Si, showing strong many-body effects in relaxation at excitation density less than 1018cm-3.
Original language | English |
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Article number | 035201 |
Journal | Physical Review B |
Volume | 97 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2018 Jan 3 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics