| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9586184 | Journal of Luminescence | 2005 | 5 Pages |
Abstract
The energy splitting of valence band in oxychalcogenides LaCuOCh (Ch=S, Se) was studied through degenerative four-wave mixing (DFWM) signals excited by femtosecond laser pulses and high-resolution absorption spectra at 4Â K. The DFWM signals for LaCuOS exhibited a beat structure with a period of 480Â fs just at the exciton peak energy, indicating that the lowest exciton states were split by 9Â meV, while the corresponding splitting in LaCuOSe was 125Â meV. The spin-orbit interaction of Ch ion accompanied by the hybridization of Cu 3d orbital causes the splitting of the exciton levels.
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Authors
Hayato Kamioka, Hidenori Hiramatsu, Masahiro Hirano, Kazushige Ueda, Toshio Kamiya, Hideo Hosono,