ELECTRONIC BAND STRUCTURE OF RHOMBOHEDRAL ARSENIC STUDIED BY HIGHLY ANGLE-RESOLVED ULTRAVIOLET PHOTOELECTRON SPECTROSCOPY.

Angle-resolved ultraviolet photoemission spectra of rhombohedral arsenic have been measured and compared with the self-consistent pseudopotential calculation and with four others presented so far. The electron pocket at the L point in the Brillouin zone and the hole pocket near the T point have been directly identified in the experimentally derived band structure. It has been elucidated that contrary to early calculations only one band goes across the Fermi level near the L point, forming the electron pocket. Some special points with high symmetry have been successfully assigned in the experimental band structure.