Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.58: Poster

Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B

Shot noise in graphene three terminal ballistic devices — •Miriam del Valle¹ and Gianaurelio Cuniberti² — ¹Institute of Theoretical Physics, Universität Regensburg — ²Institute for Materials Science, TU Dresden

Graphene is in the focus of an immense scientific interest due to remarkable quantum properties which may emerge already at room temperature. We present here a study of electronic transport in single-layer graphene ribbons in three-terminal configuration set-ups, where the finite-size effects become of importance. These systems are characterized by much more complex stability diagrams than their nanotube (CNT) counterparts. A symmetry-related suppression of transmission of some states is responsible for the Fabry-Pérot interference patterns obtained for CNT devices, whereas these “dark states” become conducting for graphene. This additional complexity is investigated by analizing shot noise properties.