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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...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
2018
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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. |
format | Online Article Text |
id | pubmed-6420072 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
record_format | MEDLINE/PubMed |
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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