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Snake trajectories in ultraclean graphene p-n junctions

Rickhaus, Peter and Makk, Peter and Liu, Ming-Hao and Tovari, Endre and Weiss, Markus and Maurand, Romain and Richter, Klaus and Schönenberger, Christian. (2015) Snake trajectories in ultraclean graphene p-n junctions. Nature communications, 6. p. 6470.

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Official URL: http://edoc.unibas.ch/41342/

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Abstract

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 20mT. 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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Rickhaus, Peter and Makk, Peter and Weiss, Markus and Maurand, Romain and Schönenberger, Christian
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
ISSN:2041-1723
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Jun 2016 11:02
Deposited On:17 May 2016 06:45

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