Snake trajectories in ultraclean graphene p–n junctions

Peter Rickhaus, Péter Makk (), Ming-Hao Liu, Endre Tóvári, Markus Weiss, Romain Maurand, Klaus Richter and Christian Schönenberger
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Peter Rickhaus: University of Basel
Péter Makk: University of Basel
Ming-Hao Liu: Institut für Theoretische Physik,Universität Regensburg
Endre Tóvári: Budapest University of Technology and Economics and Condensed Matter Research Group of the Hungarian Academy of Sciences
Markus Weiss: University of Basel
Romain Maurand: University Grenoble Alpes, CEA-INAC-SPSMS
Klaus Richter: Institut für Theoretische Physik,Universität Regensburg
Christian Schönenberger: University of Basel

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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 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.

Date: 2015
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DOI: 10.1038/ncomms7470

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