Angle Resolved Photoemission Spectroscopy of the InP 001/ surface

The P-rich 2=1.r 2=2.and the In-rich 2=4.reconstructions of InP 001.are studied by Angle Resolved Photoemission Spectroscopy ARPES.. Experimental results for the In-rich 2=4.InP 001.surface show two bound surface states and one surface resonance, located at y1.6 eV binding energy. This agrees well with ab-initio calculations. For the P-rich 2=1.r 2=2.InP 001.surface, neither theoretical nor experimental work regarding the electronic surface structure exists until now. We identify two possible surface states showing no discernible dispersion along the G–J and G–JX directions of the surface Brillouin zone SBZ.. The energetically highest state, located close to the valence band maximum VBM., is only observed along thew110xdirection and is most likely a P-dimer-bond state. The second state, located at y4.4 eV binding energy, is assigned to a surface resonance. q2000 Elsevier Science B.V. All rights reserved.