Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-02-18
Phys.Rev. B 81, 195441 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 9 figures; revised version (minor improvements to the text, replaced Fig. 7); to be published in Physical Review B
Scientific paper
10.1103/PhysRevB.81.195441
We numerically investigate the effect of Klein tunneling on the Aharonov-Bohm oscillations in graphene rings using a tight-binding model with nearest-neighbor couplings. In order to introduce Klein tunneling into the system, we apply an electrostatic potential to one of the arms of the ring, such that this arm together with the two adjacent leads form either a $nn'n$- or $npn$-junction ($n,n'$: conduction band transport, $p$: valence band transport). The former case corresponds to normal tunneling and the latter case to Klein tunneling. We find that the transmission properties strongly depend on the smoothness of the $pn$-interfaces. In particular, for sharp junctions the amplitude profile is symmetric around the charge neutrality point in the gated arm, whereas for smooth junctions the Aharonov-Bohm oscillations are strongly suppressed in the Klein tunneling as compared to the normal tunneling regime.
Bohr Dan
Schelter Jörg
Trauzettel Björn
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