Yu S.-W. ; Müller N. ; Heinzmann U. ; Pettenkofer C. ; Klein A. ; Blaha P.: Band symmetries of GaSe(0001) studied by spin-resolved electron spectroscopy using circularly polarized radiation. Physical Review B 69 (2004), p. 045320/1-7
Abstract:
We have studied the symmetry properties of the layered semiconductor gaSe along Delta direction by means of spin-resolved electron spectroscopy using circularly polarized synchrotron radiation and by means of arelativistic LAPW band-structure calculation. The photoelectron spectra show in the main a pair of weakly dispersing peaks caused by the direct transitions from valence band states with symmetry delta 5,9, delta6,9, and delta5,7, delta6,8. Our data determine the spin orbit splitting of these valence bands to be delta Eso=0.3+- 0.1 eV. We find a gap in the unoccupied bands along Delta about 8 eV above the fundamental gap.