Chirality-Assisted Electronic Cloaking in Bilayer Graphene Nanostructures

Details Chirality-Assisted Electronic Cloaking in Bilayer Graphene Nanostructures Chirality-Assisted Electronic Cloaking in Bilayer Graphene Nanostructures

2011-06-06

arxiv.org/abs/1106.1142v1

Phys. Rev. Lett. 107, 156603 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pgs, 5 fgs

Scientific paper

10.1103/PhysRevLett.107.156603

We show that the strong coupling of pseudospin orientation and charge carrier motion in bilayer graphene has a drastic effect on transport properties of ballistic p-n-p junctions. Electronic states with zero momentum parallel to the barrier are confined under it for one pseudospin orientation, whereas states with the opposite pseudospin tunnel through the junction totally uninfluenced by the presence of confined states. We demonstrate that the junction acts as a cloak for confined states, making them nearly invisible to electrons in the outer regions over a range of incidence angles. This behavior is manifested in the two-terminal conductance as transmission resonances with non-Lorentzian, singular peak shapes. The response of these phenomena to a weak magnetic field or electric-field-induced interlayer gap can serve as an experimental fingerprint of electronic cloaking.

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