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Data for Visualizing electrostatic gating effects in two-dimensional heterostructures
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Nguyen, Paul V., Teutsch, Natalie C., Wilson, Nathan, Kahn, Joshua, Xia, Xue, Graham, Abigail J., Kandyba, Viktor, Giampietri, Alessio, Barinov, Alexei, Constantinescu, Gabriel C., Yeung, Nelson, Hine, Nicholas D. M., Xu, Xiaodong, Cobden, David H. and Wilson, Neil R. (2019) Data for Visualizing electrostatic gating effects in two-dimensional heterostructures. [Dataset]
Archive (ZIP) (ARPES, optical spectroscopy and GW data)
Data for Visualizing electrostatic gating effects in 2D heterostructures.zip - Published Version Available under License Creative Commons Attribution 4.0. Download (11Mb) |
Official URL: http://wrap.warwick.ac.uk/116301
Abstract
Abstract: The ability to directly monitor the states of electrons in modern field-effect devices, for example imaging local changes in the electrical potential, Fermi level and band structure as a gate voltage is applied, could transform understanding of the device physics and function. Here we show that submicrometre angle-resolved photoemission spectroscopy1–3 (-ARPES) applied to two-dimensional van der Waals heterostructures4 affords this ability. In two-terminal graphene devices we observe a shift of the Fermi level across the Dirac point, with no detectable change in the dispersion, as a gate voltage is applied. In two-dimensional semiconductor devices we see the conduction band edge appear as electrons accumulate, thereby firmly establishing its energy and momentum. In the case of monolayer WSe2 we observe that the band gap is renormalized downwards by several hundred meV, approaching the exciton energy, as the electrostatic doping increases. Both optical spectroscopy and -ARPES can be carried out on a single device, allowing definitive studies of the relationship between gate-controlled electronic and optical properties. The technique provides a powerful new means to study not only fundamental semiconductor physics but also intriguing phenomena such as topological transitions5 and many-body spectral reconstructions under electrical control.
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Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Heterostructures -- Research, Nanostructured materials, Emission spectroscopy, Graphene, Solid state electronics, Fermions | |||||||||||||||||||||||||||||||||||||||
Publisher: | University of Warwick, Department of Physics | |||||||||||||||||||||||||||||||||||||||
Official Date: | 5 May 2019 | |||||||||||||||||||||||||||||||||||||||
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Status: | Not Peer Reviewed | |||||||||||||||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||||||||||||||
Media of Output (format): | .txt .png | |||||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||||||||||||||||||||
Copyright Holders: | University of Warwick | |||||||||||||||||||||||||||||||||||||||
Description: | ARPES, optical spectroscopy and GW data for Figures 1, 2, 3 and 4 of associated publication |
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Date of first compliant deposit: | 5 June 2019 | |||||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 5 June 2019 | |||||||||||||||||||||||||||||||||||||||
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