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arXiv · 1912.10482

Excellent electronic transport in heterostructures of graphene and monoisotopic boron-nitride grown at atmospheric pressure

J. Sonntag·J. Li·A. Plaud·A. Loiseau·J. Barjon·J. H. Edgar·C. Stampfer
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Abstract

Hexagonal boron nitride (BN), one of the very few layered insulators, plays a crucial role in 2D materials research. In particular, BN grown with a high pressure technique has proven to be an excellent substrate material for graphene and related 2D materials, but at the same time very hard to replace. Here we report on a method of growth at atmospheric pressure as a true alternative for producing BN for high quality graphene/BN heterostructures. The process is not only more scalable, but also allows to grow isotopically purified BN crystals. We employ Raman spectroscopy, cathodoluminescence, and electronic transport measurements to show the high-quality of such monoisotopic BN and its potential for graphene-based heterostructures. The excellent electronic performance of our heterostructures is demonstrated by well developed fractional quantum Hall states, ballistic transport over distances around $10\,\mathrm{\mu m}$ at low temperatures and electron-phonon scattering limited transport at room temperature.

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J. Sonntag, J. Li, A. Plaud, A. Loiseau, J. Barjon, J. H. Edgar, C. Stampfer. 2019-12-22. Excellent electronic transport in heterostructures of graphene and monoisotopic boron-nitride grown at atmospheric pressure. https://doi.org/10.1088/2053-1583%2Fab89e5

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