Electronic states of NbB2(0001), TaB2(0001) and ZrB2(0001) surfaces studied by angle-resolved ultraviolet photoelectron spectroscopy

S. Kumashiro, H. Tanaka, Y. Kawamata, H. Yanagisawa, K. Momose, G. Nakamura, C. Oshima, S. Otani

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We have investigated the surface electronic structures of transition-metal diboride (0001) surfaces by angle-resolved ultraviolet photoelectron spectroscopy (AR.UPS) and ab-initio calculations based on the slab model with 13 layers. In the spectra of NbB2 and TaB2, the peaks near -1 eV blow EF are derived from the π band of their surface graphitic boron layer. As compared with graphene, the dispersion curves of the π bonds are greatly modulated by the hybridization of B-π orbits with the metal d orbits. On the other hand, the similar peaks were not observed in spectra of ZrB2, of which the surface is terminated with Zr atoms.

Original languageEnglish
Pages (from-to)100-104
Number of pages5
Journale-Journal of Surface Science and Nanotechnology
Volume4
DOIs
Publication statusPublished - 2006 Jan 19

Keywords

  • Ab-initio calculations
  • Angle-resolved ultraviolet photoelectron spectroscopy
  • Electronic structure
  • Transition-metal diboride

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Materials Science (miscellaneous)

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