Electronic Structure of Exfoliated and Epitaxial Hexagonal Boron Nitride

Abstract

Hexagonal boron nitride (hBN) is an essential component in van der Waals heterostructures as it provides high quality and weakly interacting interfaces that preserve the electronic properties of adjacent materials. While exfoliated flakes of hBN have been extensively studied using electron transport and optical probes, detailed experimental measurements of the energy- and momentum- dependent electronic excitation spectrum are lacking. Here, we directly determine the full valence band (VB) electronic structure of micron-sized exfoliated flakes of hBN using angle-resolved photoemission spectroscopy with micrometer spatial resolution. We identify the π- and σ-band dispersions, the hBN stacking order and determine a total VB bandwidth of 19.4 eV. We compare these results with electronic structure data for epitaxial hBN on graphene on silicon carbide grown in situ using a borazine precursor. The epitaxial growth and electronic properties are investigated using photoe- mission electron microscopy. Our measurements show that the fundamental electronic properties of hBN are highly dependent on the fabrication strategy.

arXiv comment10 pages, 8 figures

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• Visualizing band structure hybridization and superlattice effects in twisted MoS${}_2$/WS${}_2$ heterobilayers
• Non-linear optics at twist interfaces in h-BN/SiC heterostructures
• Direct visualization and control of SrOx segregation on semiconducting Nb doped SrTiO3 (100) surface
• Revealing flat bands and hybridization gaps in a twisted bilayer graphene device with microARPES
• Phonon-Mediated Quasiparticle Lifetime Renormalizations in Few-Layer Hexagonal Boron Nitride
• Sequential lithium deposition on hexagonal boron nitride monolayer on Ir(111): Identifying intercalation and adsorption
• Structural and Electronic Properties of Defective AlN/GaN Hybrid Nanostrutures
• Persistence of charge ordering instability to Coulomb engineering in the excitonic insulator candidate TiSe${}_2$
• Direct visualization of gate-tunable flat bands in twisted double bilayer graphene
• Monolayer van der Waals kagome lattice for high-temperature flat-band physics