Origin of half-semimetallicity induced at interfaces of C-BN heterostructures

Abstract

First-principles density functional calculations are performed in C-BN heterojunctions. It is shown that the magnetism of the edge states in zigzag shaped graphene strips and polarity effects in BN strips team up to give a spin asymmetric screening that induces half-semimetallicity at the interface, with a gap of at least a few tenths of eV for one spin orientation and a tiny gap of hundredths of eV for the other. The dependence with ribbon widths is discussed, showing that a range of ribbon widths is required to obtain half-semimetallicity. These results open new routes for tuning electronic properties at nanointerfaces and exploring new physical effects similar to those observed at oxide interfaces, in lower dimensions.

4 pages, 4 figures

References in corpus (7)

• Electric Field Effect in Atomically Thin Carbon Films
• Energy Band Gap Engineering of Graphene Nanoribbons
• Energy Gaps in Graphene Nanoribbons
• Half-Metallic Graphene Nanoribbons
• Magnetic effects at the interface between nonmagnetic oxides
• Intrinsic Half-Metallicity in Modified Graphene Nanoribbons
• Energy Gaps and Stark Effect in Boron Nitride Nanoribbons

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