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Tunnel spectroscopy of localised electronic states in hexagonal boron nitride

Greenaway, M.T.; Vdovin, E.E.; Ghazaryan, D.; Misra, A.; Mischenko, A.; Cao, Y.; Wang, Z.; Walbank, J.R.; Holwill, M.; Khanin, Yu.N.; Morozov, S.V.; Watanabe, K.; Taniguchi, T.; Makarovsky, O.; Fromhold, T.M.; Patané, A.; Geim, A.K.; Falko, V.I.; Novoselov, K.S.; Eaves, L.

Authors

M.T. Greenaway

E.E. Vdovin

D. Ghazaryan

A. Misra

A. Mischenko

Y. Cao

Z. Wang

J.R. Walbank

M. Holwill

Yu.N. Khanin

S.V. Morozov

K. Watanabe

T. Taniguchi

O. Makarovsky

T.M. Fromhold

A. Patané

A.K. Geim

V.I. Falko

K.S. Novoselov

L. Eaves



Abstract

Hexagonal boron nitride is a large band gap layered crystal, frequently incorporated in van der Waals heterostructures as an insulating or tunnel barrier. Localised states with energies within its band gap can emit visible light, relevant to applications in nanophotonics and quantum information processing. However, they also give rise to conducting channels, which can induce electrical breakdown when a large voltage is applied. Here we use gated tunnel transistors to study resonant electron tunnelling through the localised states in few atomic-layer boron nitride barriers sandwiched between two monolayer graphene electrodes. The measurements are used to determine the energy, linewidth, tunnelling transmission probability, and depth within the barrier of more than 50 distinct localised states. A three-step process of electron percolation through two spatially separated localised states is also investigated.

Journal Article Type Article
Publication Date Dec 14, 2018
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 1
Article Number 94
APA6 Citation Greenaway, M., Vdovin, E., Ghazaryan, D., Misra, A., Mischenko, A., Cao, Y., …Eaves, L. (2018). Tunnel spectroscopy of localised electronic states in hexagonal boron nitride. Communications Physics, 1, doi:10.1038/s42005-018-0097-1
DOI https://doi.org/10.1038/s42005-018-0097-1
Publisher URL https://www.nature.com/articles/s42005-018-0097-1

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