Greenaway_et_al-2018-Communications_Physics.pdf (1.71 MB)
Tunnel spectroscopy of localised electronic states in hexagonal boron nitride
journal contribution
posted on 2018-12-18, 14:14 authored by Mark GreenawayMark Greenaway, E.E. Vdovin, D. Ghazaryan, A. Misra, A. Mishchenko, Y. Cao, Z. Wang, J.R. Wallbank, M. Holwill, Yu. N. Khanin, S.V. Morozov, K. Watanabe, T. Taniguchi, O. Makarovsky, T.M. Fromhold, A. Patane, A.K. Geim, V.I. Fal'ko, K.S. Novoselov, Laurence EavesHexagonal 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 atomiclayer 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.
Funding
EU Graphene Flagship Program, European Research Council Synergy Grant Hetero2D, the Royal Society, Engineering and Physical Research Council (UK, grants EP/N007131/1 and EP/N010345/1), US Army Research Office (W911NF-16-1-0279). E.E.V. acknowledge support from Russian Science Foundation (17-12-01393), S.V.M. from NUST “MISiS” (K2-2017-009) and Yu.N.K. from RAS Presidium Program N4 (task 007-00220- 18-00).
History
School
- Science
Department
- Physics
Published in
Communications PhysicsVolume
1Issue
1Citation
GREENAWAY, M.T. ... et al., 2018. Tunnel spectroscopy of localised electronic states in hexagonal boron nitride. Communications Physics, 1: 94.Publisher
© the Authors. Published by Springer NatureVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/Acceptance date
2018-11-09Publication date
2018-12-14Notes
This is an Open Access Article. It is published by Springer under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/eISSN
2399-3650Publisher version
Language
- en