Journal
NANO LETTERS
Volume 21, Issue 24, Pages 10532-10537Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c04172
Keywords
Two-dimensional materials; two-dimensional heterostructures; two-dimensional semiconductors; angle resolved photoemission spectroscopy
Categories
Funding
- Programmable Quantum Materials, an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0019443]
- U.K. Engineering and Physical Sciences Research Council (EPSRC) [EP/P01139X/1]
- EPSRC [EP/M508184/1, EP/R513374/1]
- University of Warwick
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In this study, spatially resolved angle-resolved photoemission spectroscopy was used to monitor band structure changes in van der Waals heterostructures induced by electric fields. The results show that applying a gate voltage can shift the semiconductor bands relative to those in graphene by up to 0.2 eV.
In electronic and optoelectronic devices made from van der Waals heterostructures, electric fields can induce substantial band structure changes which are crucial to device operation but cannot usually be directly measured. Here, we use spatially resolved angle-resolved photoemission spectroscopy to monitor changes in band alignment of the component layers, corresponding to band structure changes of the composite heterostructure system, that are produced by electrostatic gating. Our devices comprise graphene on a monolayer semiconductor, WSe2 or MoSe2, atop a boron nitride dielectric and a graphite gate. Applying a gate voltage creates an electric field that shifts the semiconductor bands relative to those in the graphene by up to 0.2 eV. The results can be understood in simple terms by assuming that the materials do not hybridize.
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