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Design of van der Waals Interfaces for Broad-Spectrum Optoelectronics

Ubrig, Nicolas; Ponomarev, Evgeniy; Zultak, Johanna; Domaretskiy, Daniil; Zólyomi, Viktor; Terry, Daniel; Howarth, James; Gutiérrez-Lezama, Ignacio; Zhukov, Alexander; Kudrynskyi, Zakhar R; Kovalyuk, Zakhar D; Patanè, Amalia; Taniguchi, Takashi; Watanabe, Kenji; Gorbachev, Roman V; Fal'ko, Vladimir I; Morpurgo, Alberto F

Authors

Nicolas Ubrig *nicolas.ubrig@unige.ch†vladimir.falko@manchester.ac.uk‡alberto.morpurgo@unige.ch

Evgeniy Ponomarev

Johanna Zultak

Daniil Domaretskiy

Viktor Zólyomi

Daniel Terry

James Howarth

Ignacio Gutiérrez-Lezama

Alexander Zhukov

Zakhar R Kudrynskyi

Zakhar D Kovalyuk

Amalia Patanè

Takashi Taniguchi

Kenji Watanabe

Roman V Gorbachev

Vladimir I Fal'ko

Alberto F Morpurgo



Abstract

Van der Waals (vdW) interfaces based on 2D materials are promising for optoelectronics, as interlayer transitions between different compounds allow tailoring of the spectral response over a broad range. However, issues such as lattice mismatch or a small misalignment of the constituent layers can drastically suppress electron–photon coupling for these interlayer transitions. Here, we engineered type-II interfaces by assembling atomically thin crystals that have the bottom of the conduction band and the top of the valence band at the Γ point, and thus avoid any momentum mismatch. We found that these van der Waals interfaces exhibit radiative optical transitions irrespective of the lattice constant, the rotational and/or translational alignment of the two layers or whether the constituent materials are direct or indirect gap semiconductors. Being robust and of general validity, our results broaden the scope of future optoelectronics device applications based on two-dimensional materials.

Journal Article Type Article
Publication Date Feb 3, 2020
Print ISSN 1476-1122
Electronic ISSN 1476-4660
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
APA6 Citation Ubrig, N., Ponomarev, E., Zultak, J., Domaretskiy, D., Zólyomi, V., Terry, D., …Morpurgo, A. F. (2020). Design of van der Waals Interfaces for Broad-Spectrum Optoelectronics. Nature Materials, https://doi.org/10.1038/s41563-019-0601-3
DOI https://doi.org/10.1038/s41563-019-0601-3
Publisher URL https://www.nature.com/articles/s41563-019-0601-3?proof=t
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