Observation of quantized subband states and evidence for surface electron accumulation in CdO from angle-resolved photoemission spectroscopy
Journal Article

Published: Wednesday, September 24, 2008
Citation: Physical Review B, Volume 78, Pages 165127

Authors (4 total): L. J. Piper, L. Colakerol, A. DeMasi, K. Smith

Abstract: The electronic structure of well-ordered single-crystal thin films of CdO(100) has been studied using angle-resolved photoemission spectroscopy. Quantized electron subbands are observed above the valence-band maximum. The existence of these states provides evidence of an intrinsic electron accumulation space-charge layer near the CdO surface, an interpretation supported by coupled Poisson-Schrödinger calculations. The origin of the accumulation layer result is discussed in terms of the bulk band structure of CdO calculated using quasiparticle-corrected density-functional theory, which reveals that the conduction-band minimum at the Brillouin-zone center lies below the charge neutrality level. URL: http://link.aps.org/doi/10.1103/PhysRevB.78.165127 DOI: 10.1103/PhysRevB.78.165127