Light-induced valley currents and magnetization in graphene rings

Aharonov-Bohm effect and broken valley degeneracy in graphene rings

P. Recher,1,2 B. Trauzettel,3,4 A. Rycerz,5 Ya. M. Blanter,2 C. W. J. Beenakker,1 and A. F. Morpurgo2 1Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands 2Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands 3Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, 4056 Basel, Swi...

Persistent and Radiation-Induced Currents in Distorted Quantum Rings

Magnetization in molecular iron rings

B. Normand, X. Wang, X. Zotos, and Daniel Loss Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany Departement für Physik und Astronomie, Universität Basel, CH-4056 Basel, Switzerland Institut Romand de Recherche Numérique en Physique des Materiaux (IRRMA), PPH-Ecublens, CH-1015 Lausanne, Switzerland Max-Plan...

Graphene Rings in Magnetic Fields: Aharonov-Bohm Effect and Valley Splitting

We study the conductance of mesoscopic graphene rings in the presence of a perpendicular magnetic field by means of numerical calculations based on a tightbinding model. First, we consider the magnetoconductance of such rings and observe the Aharonov-Bohm effect. We investigate different regimes of the magnetic flux up to the quantum Hall regime, where the Aharonov-Bohm oscillations are suppres...

Magnetization Manipulation in Nanostructures by Spin Currents

The program investigates the ultra-fast manipulation of the magnetization in nanostructures by spin currents, one of the forefront and most challenging areas in magnetism research. The research explores novel opportunities to manipulate the magnetization on the nanometer length scale and picosecond time scale, based on utilization of the strong, short range quantum mechanical exchange interacti...