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

L. F.J. Piper, Leyla Colakerol, P. D.C. King, A. Schleife, J. Zúñiga-Pérez, Per Anders Glans, Tim Learmonth, A. Federov, T. D. Veal, F. Fuchs, V. Muñoz-Sanjosé, F. Bechstedt, C. F. McConville, Kevin E. Smith

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article number165127
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number16
DOIs
StatePublished - Oct 29 2008
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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