Graphene levitons and anti-levitons in magnetic fields
journal contributionposted on 2014-07-01, 15:04 authored by Derek Michael Forrester, Feodor Kusmartsev
The leviton is an electron or hole wavepacket that rides the surface of the Fermi sea. When a series of Lorentzian or Gaussian time dependent pulses are applied to an ultracold system a soliton-like excitation with only one electron and no localised hole emerges. Graphene is a unique system where the Fermi surface may arise from a Dirac point and therewith the levitons character may display many interesting features. For example, the leviton formation may be associated with a chiral anomaly, and inside a single potential step an anti-leviton forms. We show that the application of weak magnetic fields may switch on and off the leviton Klein tunnelling. Also, in a moderate field negative refraction arises along a curved trajectory, whereas with a stronger field a new elementary excitation – the levity vortex – in the reflected wavefunction occurs. Herein we describe these phenomena in detail along with a complete explanation of the transmission of graphene levitons at a step potential in terms of the probability densities and a series of phase diagrams and the tunnelling times.
- Aeronautical, Automotive, Chemical and Materials Engineering
- Chemical Engineering
Pages7594 - 7603 (9)
CitationFORRESTER, D.M. and KUSMARTSEV, F.V., 2014. Graphene levitons and anti-levitons in magnetic fields. Nanoscale, 6, pp.7594-7603.
PublisherRoyal Society of Chemistry
- VoR (Version of Record)
NotesThis article is licensed under a Creative Commons Attribution 3.0 Unported Licence.