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, 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.
Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Peter
P
Rickhaus
Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Péter
P
Makk
Institut für Theoretische Physik,Universität Regensburg, D-93040 Regensburg, Germany.
Ming-Hao
0000000156024181
MH
Liu
Department of Physics, Budapest University of Technology and Economics and Condensed Matter Research Group of the Hungarian Academy of Sciences, Budafoki ut 8, 1111 Budapest, Hungary.
Endre
E
Tóvári
Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Markus
0000000347033558
M
Weiss
University Grenoble Alpes, CEA-INAC-SPSMS, F-38000 Grenoble, France.
Romain
R
Maurand
Institut für Theoretische Physik,Universität Regensburg, D-93040 Regensburg, Germany.
Klaus
K
Richter
Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Christian
C
Schönenberger