Snake Trajectories in Ultraclean Graphene p-n Junctions

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. Whereas the former has been demonstrated in GaAs-AlGaAs heterostructures, the latter has become conceivable only with the advance of ballistic graphene where a gapless p-n interface governed by Klein tunneling 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

Accepted for publication in Nature Communications

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• Colorimetry technique for scalable characterization of suspended graphene
• Imaging snake orbits at graphene n-p junctions
• Lorentz force effects for graphene Aharonov-Bohm interferometers
• Chiral interface states in graphene $p$-$n$ junctions
• Graphene pn-junction in a quantizing magnetic field: Conductance at intermediate disorder strength
• Ballistic Anisotropic Magnetoresistance in Core Shell Nanowires and Rolled-up Nanotubes
• Nonlinear response of a ballistic graphene transistor with an ac-driven gate: high harmonic generation and THz detection