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HL: Fachverband Halbleiterphysik
HL 75: Transport: Majorana fermions (organized by TT)
HL 75.4: Talk
Wednesday, April 2, 2014, 15:45–16:00, HSZ 03
Absence of Aharonov-Bohm effect of chiral Majorana fermion edge states — •Sunghun Park1,4, Joel Moore2,3, and Heung-Sun Sim1 — 1Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea — 2Department of Physics, University of California, Berkeley, California 94720, USA — 3Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA — 4Institute for Mathematical Physics, TU Braunschweig, 38106 Braunschweig, Germany
Majorana fermions in a superconductor hybrid system are charge neutral zero-energy states. For the detection of this unique feature, we propose an interferometry of a chiral Majorana edge channel, formed along the interface between a superconductor and a topological insulator under an external magnetic field perpendicular to the surface of the topological insulator. The superconductor is of a ring shape and has a Josephson junction that allows the Majorana state to enclose continuously tunable magnetic flux. Zero-bias differential electron conductance between the Majorana state and a normal lead is found to be independent of the flux at zero temperature, manifesting the Majorana feature of a charge neutral zero-energy state. To compare with a non-Majorana case, we consider the same setup on graphene. In this case, the setup has no Majorana states and shows Aharonov-Bohm effects.