Coulomb engineering of the bandgap and excitons in two-dimensional materials
Abstrak
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. Electronic bandgap tuning in semiconductors enables key functionalities in solid-state devices. Here, the authors present a strategy to control the bandgap of atomically thin WS2 and WSe2semiconductors via manipulation of the surrounding dielectric environment rather than by modifications of the materials themselves.
Topik & Kata Kunci
Penulis (16)
A. Raja
A. Chaves
Jaeeun Yu
Ghidewon Arefe
H. Hill
A. Rigosi
Timothy C. Berkelbach
P. Nagler
C. Schüller
T. Korn
C. Nuckolls
J. Hone
L. Brus
T. Heinz
D. Reichman
A. Chernikov
Akses Cepat
- Tahun Terbit
- 2017
- Bahasa
- en
- Total Sitasi
- 688×
- Sumber Database
- Semantic Scholar
- DOI
- 10.1038/ncomms15251
- Akses
- Open Access ✓