Interplay of the Aharonov-Bohm effect and Klein tunneling in graphene

Schelter, Joerg and Bohr, Dan and Trauzettel, Bjoern. (2010) Interplay of the Aharonov-Bohm effect and Klein tunneling in graphene. Physical Review B, Vol. 81, H. 19 , 195441.

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Official URL: http://edoc.unibas.ch/dok/A5841333

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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 and 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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Bruder)
UniBasel Contributors:Bohr, Dan
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Institute of Physics
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Sep 2012 07:19
Deposited On:14 Sep 2012 06:52

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