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TT: Fachverband Tiefe Temperaturen
TT 10: Nanotubes and Nanoribbons
TT 10.6: Vortrag
Montag, 16. März 2020, 12:45–13:00, HSZ 204
Four-terminal graphene-based nanostructures for electron quantum optical stups — Sofia Sanz1, Pedro Brandimarte1, Daniel Sánchez-Portal2, •Géza Giedke1,3, and Thomas Frederiksen1,3 — 1Donostia International Physics Center (DIPC), 20018 San Sebastián, Spain — 2Centro de Física de Materiales (CFM), CSIC-UPV/EHU, 20018 San Sebastián, Spain — 3IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain
Graphene nanoribbons (GNRs) an attractive basis for coherent electron transport. We study configurations that provide functionalities for simple "electron quantum optics" setups.
A central building block of such setups is the four-terminal device formed by two GNRs crossing each other at 60 degrees.
Using a tight-binding approximation and the Green's function formalism we analyze the transmission amplitudes between the four arms for low-energy electrons. Studying different widths, stackings and GNR edge topologies, we identify promising settings with suppressed back-scattering and those realizing functionalities such a 50:50 beam splitting or full transfer between the stacked ribbons. Applications for GNR-based interferometers are discussed.