Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 80: Graphene
TT 80.4: Vortrag
Donnerstag, 15. März 2018, 10:15–10:30, H 3005
Quantum interference assisted spin-filtering in graphene nanoflakes — •Angelo Valli1,2, Adriano Amaricci1,2, Valentina Brosco1,2, and Massimo Capone1,2 — 1Scuola Superiore di Studi Avanzati (SISSA), Trieste, Italy — 2Democritos National Simulation Center, CNR-IOM, Trieste, Italy
We present a theoretical investigation of the transport properties through magnetic zigzag graphene nanoflakes. In the ballistic regime, we identify transmission antiresonances as clear fingerprints of destructive quantum interference (QI), analogous to those observed in molecular junctions. The QI antiresonances are remarkably robust and can be rationalized in terms of symmetries. In the presence of short-range magnetic ordering, the interplay of QI and magnetism results in spin-resolved QI features and in a nearly-perfect QI-assisted spin-filtering effect. We also devise a protocol to achieve electrostatic control over the efficiency of the spin filter. Such a device benefits of the extraordinary conduction properties of graphene, and operates without any external magnetic field, paving the path toward QI-assisted spintronics.