Ballistic interferences in suspended graphene

Rickhaus, Rickhaus and Maurand, Romain and Liu, Ming-Hao and Weiss, Markus and Richter, Klaus and Schönenberger, Christian. (2013) Ballistic interferences in suspended graphene. Nature communications, Vol. 4 , Article Nr. 2342.

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Official URL: http://edoc.unibas.ch/dok/A6212023

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The low-energy electronic excitations in graphene are described by massless Dirac fermions that have a linear dispersion relation. Taking advantage of this ‘optics-like’ electron dynamics, generic optical elements like lenses and wave guides have been proposed for electrons in graphene. Tuning of these elements relies on the ability to adjust the carrier concentration in defined areas. However, the combination of ballistic transport and complex gating remains challenging. Here we report on the fabrication and characterization of suspended graphene p–n junctions. By local gating, resonant cavities can be defined, leading to complex Fabry–Pérot interferences. The observed conductance oscillations account for quantum interference of electrons propagating ballistically over distances exceeding 1 μm. Visibility of the interferences is demonstrated to be enhanced by Klein collimation at the p–n interface. This finding paves the way to more complex gate-controlled ballistic graphene devices and brings electron optics in graphene closer to reality.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Rickhaus, Peter and Maurand, Romain and Weiss, Markus
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:31 Jan 2014 09:51
Deposited On:31 Jan 2014 09:51

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