Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-05-05
Phys. Rev. B 82, 205430 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 10 figures
Scientific paper
10.1103/PhysRevB.82.205430
The time evolution of a wavepacket in strained graphene is studied within the tight-binding model and continuum model. The effect of an external magnetic field, as well as a strain-induced pseudo-magnetic field, on the wave packet trajectories and zitterbewegung are analyzed. Combining the effects of strain with those of an external magnetic field produces an effective magnetic field which is large in one of the Dirac cones, but can be practically zero in the other. We construct an efficient valley filter, where for a propagating incoming wave packet consisting of momenta around the K and K' Dirac points, the outgoing wave packet exhibits momenta in only one of these Dirac points, while the components of the packet that belong to the other Dirac point are reflected due to the Lorentz force. We also found that the zitterbewegung is permanent in time in the presence of either external or strain-induced magnetic fields, but when both the external and strain-induced magnetic fields are present, the zitterbewegung is transient in one of the Dirac cones, whereas in the other cone the wave packet exhibits permanent spatial oscillations.
Chaves Andrey
Covaci Lucian
Farias G. A.
Peeters François M.
Rakhimov Yu. Kh.
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