Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 80: Graphene

TT 80.5: Vortrag

Donnerstag, 15. März 2018, 10:30–10:45, H 3005

Valleytronics in elastically defomed graphene — •Nikodem Szpak¹, Thomas Stegmann², and Ralf Schützhold¹ — ¹Faculty of Physics, University of Duisburg-Essen, Germany — ²Instituto de Ciencias Fisicas, Universidad Nacional Autonoma de Mexico, Cuernavaca, Mexico

Electrons in graphene obey at low energies the 2D-Dirac equation with two psuedospin (valley) degrees of freedom. Manipulation of the valley polarization of the electronic current has potential applications in nanoelectronics, known as valleytronics. We discuss systems based on elastically deformed graphene in which the Dirac equation couples to effective curvature and pseudo-magnetic field introduced by strain. We introduce the basic theory and special approximations developed to enable an efficient design of intended valleytronic systems. We present results of numerical simulations of the current flow and compare different models. Finally, we present particular systems for efficient manipulation of the valley polarization which, among others, can act as ultrasensitive nanosensors.