Snake trajectories in ultraclean graphene p–n junctions

Citations Over TimeTop 10% of 2015 papers

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.

Related Papers

• → Evolution of the quantized ballistic conductance with increasing disorder in narrow-wire arrays(1991)33 cited
• → Quantized conductance of a quasi-ballistic one-dimensional wire(1992)20 cited
• → Quantized Conductance of Metallic Narrow Channels in Ballistic Regime(1988)22 cited
• → Enhancement of the conductance-fluctuation amplitude in ballistic quantum cavities(2001)4 cited
• → On the Quantized Conductance of Small Contacts(1990)