Snake trajectories in ultraclean graphene p-n junctions

Peter Rickhaus, Péter Makk, Ming Hao Liu, Endre Tóvári, Markus Weiss, Romain Maurand, Klaus Richter, Christian Schönenberger

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)

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.

Original languageEnglish
Article number6470
JournalNature communications
Volume6
DOIs
Publication statusPublished - 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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