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Snake trajectories in ultraclean graphene p–n junctions

Snake states are trajectories of charge carriers curving back and forth along an interface. There are two types of snake states, formed by either inverting the magnetic field direction or the charge carrier type at an interface. The former has been demonstrated in GaAs–AlGaAs heterostructures, where...

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Autores principales: Rickhaus, Peter, Makk, Péter, Liu, Ming-Hao, Tóvári, Endre, Weiss, Markus, Maurand, Romain, Richter, Klaus, Schönenberger, Christian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Pub. Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4366485/
https://www.ncbi.nlm.nih.gov/pubmed/25732244
http://dx.doi.org/10.1038/ncomms7470
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author Rickhaus, Peter
Makk, Péter
Liu, Ming-Hao
Tóvári, Endre
Weiss, Markus
Maurand, Romain
Richter, Klaus
Schönenberger, Christian
author_facet Rickhaus, Peter
Makk, Péter
Liu, Ming-Hao
Tóvári, Endre
Weiss, Markus
Maurand, Romain
Richter, Klaus
Schönenberger, Christian
author_sort Rickhaus, Peter
collection PubMed
description Snake states are trajectories of charge carriers curving back and forth along an interface. There are two types of snake states, formed by either inverting the magnetic field direction or the charge carrier type at an interface. The former has been demonstrated in GaAs–AlGaAs heterostructures, whereas the latter has become conceivable only with the advance of ballistic graphene where a gap-less p–n interface governed by Klein tunnelling can be formed. Such snake states were hidden in previous experiments due to limited sample quality. Here we report on magneto-conductance oscillations due to snake states in a ballistic suspended graphene p–n junction, which occur already at a very small magnetic field of 20 mT. The visibility of 30% is enabled by Klein collimation. Our finding is firmly supported by quantum transport simulations. We demonstrate the high tunability of the device and operate it in different magnetic field regimes.
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spelling pubmed-43664852015-04-02 Snake trajectories in ultraclean graphene p–n junctions Rickhaus, Peter Makk, Péter Liu, Ming-Hao Tóvári, Endre Weiss, Markus Maurand, Romain Richter, Klaus Schönenberger, Christian Nat Commun Article Snake states are trajectories of charge carriers curving back and forth along an interface. There are two types of snake states, formed by either inverting the magnetic field direction or the charge carrier type at an interface. The former has been demonstrated in GaAs–AlGaAs heterostructures, whereas the latter has become conceivable only with the advance of ballistic graphene where a gap-less p–n interface governed by Klein tunnelling can be formed. Such snake states were hidden in previous experiments due to limited sample quality. Here we report on magneto-conductance oscillations due to snake states in a ballistic suspended graphene p–n junction, which occur already at a very small magnetic field of 20 mT. The visibility of 30% is enabled by Klein collimation. Our finding is firmly supported by quantum transport simulations. We demonstrate the high tunability of the device and operate it in different magnetic field regimes. Nature Pub. Group 2015-03-03 /pmc/articles/PMC4366485/ /pubmed/25732244 http://dx.doi.org/10.1038/ncomms7470 Text en Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Rickhaus, Peter
Makk, Péter
Liu, Ming-Hao
Tóvári, Endre
Weiss, Markus
Maurand, Romain
Richter, Klaus
Schönenberger, Christian
Snake trajectories in ultraclean graphene p–n junctions
title Snake trajectories in ultraclean graphene p–n junctions
title_full Snake trajectories in ultraclean graphene p–n junctions
title_fullStr Snake trajectories in ultraclean graphene p–n junctions
title_full_unstemmed Snake trajectories in ultraclean graphene p–n junctions
title_short Snake trajectories in ultraclean graphene p–n junctions
title_sort snake trajectories in ultraclean graphene p–n junctions
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4366485/
https://www.ncbi.nlm.nih.gov/pubmed/25732244
http://dx.doi.org/10.1038/ncomms7470
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