Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 54: Transport: Carbon Nanotubes
TT 54.8: Vortrag
Mittwoch, 9. März 2016, 17:15–17:30, H22
Electronic transport in strained, bent and deformed nanotubes in presence of magnetic field — Magdulin Dwedari1, Eric Kleinherbers1, Lennart Korsten1, Thomas Stegmann1,2, and •Nikodem Szpak1 — 1Fakultät für Physik, Universität Duisburg-Essen, Duisburg — 2Instituto de Ciencias Fisicas, Universidad Nacional Autonoma de Mexico, Cuernavaca
Due to imminent applications in nanoelectronics it is of high interest to better understand the precise conductance properties of various types carbon nanotubes. Since low-energy electronic excitations in graphene behave like massless Dirac fermions the current flow can be approximated semiclassically and used as a guide in the design of conducting nanotube-elements. We compare two alternative approaches to the electronic transport: a) current flows obtained with the non-equillibrium Green's function (NEGF) method from the tight-binding model with local strain and external magnetic field, b) classical trajectories for relativistic point particles moving in a curved surface with pseudo-magnetic and magnetic field. We discuss several setups and effects of special interest: gap engineering in strained nanotubes with parallel magnetic field, magnetic field-effect transistor and current flow paths in bent and deformed nanotubes. We compare results obtained theoretically with numerical simulations.