Dresden 2020 – wissenschaftliches Programm

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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 stupsSofia Sanz1, Pedro Brandimarte1, Daniel Sánchez-Portal2, •Géza Giedke1,3, and Thomas Frederiksen1,31Donostia 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.

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