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Polarization switching and electrical control of interlayer excitons in two-dimensional van der Waals heterostructures

Long-lived interlayer excitons in van der Waals heterostructures based on transition metal dichalcogenides, together with unique spin-valley physics, make them promising for next-generation photonic and valleytronic devices. While the emission characteristics of interlayer excitons have been studied...

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Autores principales: Ciarrocchi, Alberto, Unuchek, Dmitrii, Avsar, Ahmet, Watanabe, Kenji, Taniguchi, Takashi, Kis, Andras
Formato: Online Artículo Texto
Lenguaje:English
Publicado: 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6420072/
https://www.ncbi.nlm.nih.gov/pubmed/30886643
http://dx.doi.org/10.1038/s41566-018-0325-y
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author Ciarrocchi, Alberto
Unuchek, Dmitrii
Avsar, Ahmet
Watanabe, Kenji
Taniguchi, Takashi
Kis, Andras
author_facet Ciarrocchi, Alberto
Unuchek, Dmitrii
Avsar, Ahmet
Watanabe, Kenji
Taniguchi, Takashi
Kis, Andras
author_sort Ciarrocchi, Alberto
collection PubMed
description Long-lived interlayer excitons in van der Waals heterostructures based on transition metal dichalcogenides, together with unique spin-valley physics, make them promising for next-generation photonic and valleytronic devices. While the emission characteristics of interlayer excitons have been studied, efficient manipulation of their valley-state, a necessary requirement for information encoding, is still lacking. Here, we demonstrate comprehensive electrical control of interlayer excitons in a MoSe(2)/WSe(2) heterostructure. Encapsulation of our well-aligned stack with hexagonal boron nitride (h-BN) allows us to resolve two separate narrow interlayer transitions with opposite helicities under circularly polarized excitation, either preserving or reversing the polarization of incoming light. By electrically controlling their relative intensities, we realize a polarization switch with tuneable emission intensity and wavelength. Finally, we demonstrate large Zeeman shifts of these two transitions upon application of an external magnetic field. These results are interpreted within the picture of moiré-induced brightening of forbidden optical transitions. The ability to control the polarization of interlayer excitons is a step forward towards the manipulation of the valley degree-of-freedom in realistic device applications.
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spelling pubmed-64200722019-06-30 Polarization switching and electrical control of interlayer excitons in two-dimensional van der Waals heterostructures Ciarrocchi, Alberto Unuchek, Dmitrii Avsar, Ahmet Watanabe, Kenji Taniguchi, Takashi Kis, Andras Nat Photonics Article Long-lived interlayer excitons in van der Waals heterostructures based on transition metal dichalcogenides, together with unique spin-valley physics, make them promising for next-generation photonic and valleytronic devices. While the emission characteristics of interlayer excitons have been studied, efficient manipulation of their valley-state, a necessary requirement for information encoding, is still lacking. Here, we demonstrate comprehensive electrical control of interlayer excitons in a MoSe(2)/WSe(2) heterostructure. Encapsulation of our well-aligned stack with hexagonal boron nitride (h-BN) allows us to resolve two separate narrow interlayer transitions with opposite helicities under circularly polarized excitation, either preserving or reversing the polarization of incoming light. By electrically controlling their relative intensities, we realize a polarization switch with tuneable emission intensity and wavelength. Finally, we demonstrate large Zeeman shifts of these two transitions upon application of an external magnetic field. These results are interpreted within the picture of moiré-induced brightening of forbidden optical transitions. The ability to control the polarization of interlayer excitons is a step forward towards the manipulation of the valley degree-of-freedom in realistic device applications. 2018-12-31 2019-02 /pmc/articles/PMC6420072/ /pubmed/30886643 http://dx.doi.org/10.1038/s41566-018-0325-y Text en Users may view, print, copy, and download text and data-mine the content in such documents, for the purposes of academic research, subject always to the full Conditions of use:http://www.nature.com/authors/editorial_policies/license.html#terms
spellingShingle Article
Ciarrocchi, Alberto
Unuchek, Dmitrii
Avsar, Ahmet
Watanabe, Kenji
Taniguchi, Takashi
Kis, Andras
Polarization switching and electrical control of interlayer excitons in two-dimensional van der Waals heterostructures
title Polarization switching and electrical control of interlayer excitons in two-dimensional van der Waals heterostructures
title_full Polarization switching and electrical control of interlayer excitons in two-dimensional van der Waals heterostructures
title_fullStr Polarization switching and electrical control of interlayer excitons in two-dimensional van der Waals heterostructures
title_full_unstemmed Polarization switching and electrical control of interlayer excitons in two-dimensional van der Waals heterostructures
title_short Polarization switching and electrical control of interlayer excitons in two-dimensional van der Waals heterostructures
title_sort polarization switching and electrical control of interlayer excitons in two-dimensional van der waals heterostructures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6420072/
https://www.ncbi.nlm.nih.gov/pubmed/30886643
http://dx.doi.org/10.1038/s41566-018-0325-y
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