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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Schelter Joerg, Bohr Dan, Trauzettel Bjoern,
Project Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems
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Original article (peer-reviewed)

Journal PHYSICAL REVIEW B
Volume (Issue) 81(19)
Page(s) 195411 - 195411
Title of proceedings PHYSICAL REVIEW B

Abstract

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.
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