Cargando…
Giant magnetic splitting inducing near-unity valley polarization in van der Waals heterostructures
Monolayers of semiconducting transition metal dichalcogenides exhibit intriguing fundamental physics of strongly coupled spin and valley degrees of freedom for charge carriers. While the possibility of exploiting these properties for information processing stimulated concerted research activities to...
Autores principales: | , , , , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5691051/ https://www.ncbi.nlm.nih.gov/pubmed/29146907 http://dx.doi.org/10.1038/s41467-017-01748-1 |
_version_ | 1783279715732160512 |
---|---|
author | Nagler, Philipp Ballottin, Mariana V. Mitioglu, Anatolie A. Mooshammer, Fabian Paradiso, Nicola Strunk, Christoph Huber, Rupert Chernikov, Alexey Christianen, Peter C. M. Schüller, Christian Korn, Tobias |
author_facet | Nagler, Philipp Ballottin, Mariana V. Mitioglu, Anatolie A. Mooshammer, Fabian Paradiso, Nicola Strunk, Christoph Huber, Rupert Chernikov, Alexey Christianen, Peter C. M. Schüller, Christian Korn, Tobias |
author_sort | Nagler, Philipp |
collection | PubMed |
description | Monolayers of semiconducting transition metal dichalcogenides exhibit intriguing fundamental physics of strongly coupled spin and valley degrees of freedom for charge carriers. While the possibility of exploiting these properties for information processing stimulated concerted research activities towards the concept of valleytronics, maintaining control over spin–valley polarization proved challenging in individual monolayers. A promising alternative route explores type II band alignment in artificial van der Waals heterostructures. The resulting formation of interlayer excitons combines the advantages of long carrier lifetimes and spin–valley locking. Here, we demonstrate artificial design of a two-dimensional heterostructure enabling intervalley transitions that are not accessible in monolayer systems. The resulting giant effective g factor of −15 for interlayer excitons induces near-unity valley polarization via valley-selective energetic splitting in high magnetic fields, even after nonselective excitation. Our results highlight the potential to deterministically engineer novel valley properties in van der Waals heterostructures using crystallographic alignment. |
format | Online Article Text |
id | pubmed-5691051 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-56910512017-11-20 Giant magnetic splitting inducing near-unity valley polarization in van der Waals heterostructures Nagler, Philipp Ballottin, Mariana V. Mitioglu, Anatolie A. Mooshammer, Fabian Paradiso, Nicola Strunk, Christoph Huber, Rupert Chernikov, Alexey Christianen, Peter C. M. Schüller, Christian Korn, Tobias Nat Commun Article Monolayers of semiconducting transition metal dichalcogenides exhibit intriguing fundamental physics of strongly coupled spin and valley degrees of freedom for charge carriers. While the possibility of exploiting these properties for information processing stimulated concerted research activities towards the concept of valleytronics, maintaining control over spin–valley polarization proved challenging in individual monolayers. A promising alternative route explores type II band alignment in artificial van der Waals heterostructures. The resulting formation of interlayer excitons combines the advantages of long carrier lifetimes and spin–valley locking. Here, we demonstrate artificial design of a two-dimensional heterostructure enabling intervalley transitions that are not accessible in monolayer systems. The resulting giant effective g factor of −15 for interlayer excitons induces near-unity valley polarization via valley-selective energetic splitting in high magnetic fields, even after nonselective excitation. Our results highlight the potential to deterministically engineer novel valley properties in van der Waals heterostructures using crystallographic alignment. Nature Publishing Group UK 2017-11-16 /pmc/articles/PMC5691051/ /pubmed/29146907 http://dx.doi.org/10.1038/s41467-017-01748-1 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Nagler, Philipp Ballottin, Mariana V. Mitioglu, Anatolie A. Mooshammer, Fabian Paradiso, Nicola Strunk, Christoph Huber, Rupert Chernikov, Alexey Christianen, Peter C. M. Schüller, Christian Korn, Tobias Giant magnetic splitting inducing near-unity valley polarization in van der Waals heterostructures |
title | Giant magnetic splitting inducing near-unity valley polarization in van der Waals heterostructures |
title_full | Giant magnetic splitting inducing near-unity valley polarization in van der Waals heterostructures |
title_fullStr | Giant magnetic splitting inducing near-unity valley polarization in van der Waals heterostructures |
title_full_unstemmed | Giant magnetic splitting inducing near-unity valley polarization in van der Waals heterostructures |
title_short | Giant magnetic splitting inducing near-unity valley polarization in van der Waals heterostructures |
title_sort | giant magnetic splitting inducing near-unity valley polarization in van der waals heterostructures |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5691051/ https://www.ncbi.nlm.nih.gov/pubmed/29146907 http://dx.doi.org/10.1038/s41467-017-01748-1 |
work_keys_str_mv | AT naglerphilipp giantmagneticsplittinginducingnearunityvalleypolarizationinvanderwaalsheterostructures AT ballottinmarianav giantmagneticsplittinginducingnearunityvalleypolarizationinvanderwaalsheterostructures AT mitiogluanatoliea giantmagneticsplittinginducingnearunityvalleypolarizationinvanderwaalsheterostructures AT mooshammerfabian giantmagneticsplittinginducingnearunityvalleypolarizationinvanderwaalsheterostructures AT paradisonicola giantmagneticsplittinginducingnearunityvalleypolarizationinvanderwaalsheterostructures AT strunkchristoph giantmagneticsplittinginducingnearunityvalleypolarizationinvanderwaalsheterostructures AT huberrupert giantmagneticsplittinginducingnearunityvalleypolarizationinvanderwaalsheterostructures AT chernikovalexey giantmagneticsplittinginducingnearunityvalleypolarizationinvanderwaalsheterostructures AT christianenpetercm giantmagneticsplittinginducingnearunityvalleypolarizationinvanderwaalsheterostructures AT schullerchristian giantmagneticsplittinginducingnearunityvalleypolarizationinvanderwaalsheterostructures AT korntobias giantmagneticsplittinginducingnearunityvalleypolarizationinvanderwaalsheterostructures |