%0 Journal Article
%T Direct observation of the band structure in bulk hexagonal boron nitride
%+ Laboratoire de photonique et de nanostructures (LPN)
%+ Laboratoire des Solides Irradiés - Irradiated Solids Laboratory (LSI)
%+ Synchrotron SOLEIL (SSOLEIL)
%+ Laboratoire Charles Coulomb (L2C)
%+ Service de physique de l'état condensé (SPEC - UMR3680)
%A Henck, Hugo
%A Pierucci, Debora
%A Fugallo, Giorgia
%A Avila, Jose
%A Cassabois, Guillaume
%A Dappe, Yannick J.
%A Silly, Mathieu G.
%A Chen, Chaoyu
%A Gil, Bernard
%A Gatti, Matteo
%A Sottile, Francesco
%A Sirotti, Fausto
%A Asensio, Maria C.
%A Ouerghi, Abdelkarim
%< avec comité de lecture
%Z L2C:17-016
%@ 2469-9950
%J Physical Review B
%I American Physical Society
%V 95
%N 8
%P 085410
%8 2017-02-08
%D 2017
%R 10.1103/PhysRevB.95.085410
%Z Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]Journal articles
%X A promising route towards nanodevice applications relies on the association of graphene and transition metal dichalcogenides with hexagonal boron nitride (h-BN). Due to its insulating nature, h-BN has emerged as a natural substrate and gate dielectric for graphene-based electronic devices. However, some fundamental properties of bulk h-BN remain obscure. For example, the band structure and the position of the Fermi level have not been experimentally resolved. Here, we report a direct observation of parabolic dispersions of h-BN crystals using high-resolution angle-resolved photoemission spectroscopy (ARPES). We find that h-BN exfoliation on epitaxial graphene enables overcoming the technical difficulties of using ARPES with insulating materials. We show trigonal warping of the intensity maps at constant energy. The valence-band maxima are located around the K points, 2.5 eV below the Fermi level, thus confirming the residual p-type character of typical h-BN.
%G English
%L hal-01487020
%U https://hal.science/hal-01487020
%~ CEA
%~ X
%~ CNRS
%~ X-LSI
%~ X-DEP
%~ X-DEP-PHYS
%~ L2C
%~ IRAMIS-SPEC
%~ CEA-UPSAY
%~ UNIV-PARIS-SACLAY
%~ CEA-UPSAY-SACLAY
%~ X-SACLAY
%~ SYNCHROTRON-SOLEIL
%~ MIPS
%~ UNIV-MONTPELLIER
%~ TEST-HALCNRS
%~ ANR
%~ GS-ENGINEERING
%~ IRAMIS
%~ GS-PHYSIQUE
%~ INSTITUT-SCIENCES-LUMIERE
%~ UM-2015-2021