Coulomb engineering of the bandgap and excitons in two-dimensional materials

Archana Raja (), Andrey Chaves, Jaeeun Yu, Ghidewon Arefe, Heather M. Hill, Albert F. Rigosi, Timothy C. Berkelbach, Philipp Nagler, Christian Schüller, Tobias Korn, Colin Nuckolls, James Hone, Louis E. Brus, Tony F. Heinz, David R. Reichman and Alexey Chernikov ()
Additional contact information
Archana Raja: Columbia University
Andrey Chaves: Columbia University
Jaeeun Yu: Columbia University
Ghidewon Arefe: Columbia University
Heather M. Hill: Columbia University
Albert F. Rigosi: Columbia University
Timothy C. Berkelbach: University of Chicago
Philipp Nagler: University of Regensburg
Christian Schüller: University of Regensburg
Tobias Korn: University of Regensburg
Colin Nuckolls: Columbia University
James Hone: Columbia University
Louis E. Brus: Columbia University
Tony F. Heinz: Columbia University
David R. Reichman: Columbia University
Alexey Chernikov: Columbia University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract The ability to control the size of the electronic bandgap is an integral part of solid-state technology. Atomically thin two-dimensional crystals offer a new approach for tuning the energies of the electronic states based on the unusual strength of the Coulomb interaction in these materials and its environmental sensitivity. Here, we show that by engineering the surrounding dielectric environment, one can tune the electronic bandgap and the exciton binding energy in monolayers of WS2 and WSe2 by hundreds of meV. We exploit this behaviour to present an in-plane dielectric heterostructure with a spatially dependent bandgap, as an initial step towards the creation of diverse lateral junctions with nanoscale resolution.

Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15251

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DOI: 10.1038/ncomms15251

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