The group is funded by the Helmholtz Association (HGF), in particular by the Inititiative and Networking Fund, with the aim of building a cooperation between the RWTH Aachen and the Research Center Jülich in the field molecular electronics. It is based at the Theoretical Nanoelectronics Division of the Peter Grünberg Institute (PGI-2) for Nanoelectronics at the Research Center Jülich (Forschungszentrum Jülich) and is co-hosted by Institute for Theory of Statistical Physics at the RWTH Aachen. It is furthermore affiliated with the Institute for Quantum Information at the RWTH Aachen.
Spin-multipoletronics: why spin-currents are not enough for spintronics.
We found that for quantum dots with spin S > 1/2 embedded in circuits with ferromagnets new types of physical currents must be accounted for. These spin-multipole currents describe the non-equilibrium transport of the anisotropy of spin. This establishes an important new link between the research fields of molecular magnetism (where spin-anisotropy is intrinsically present molecules) and spintronics (where spin-properties are injected from external sources). Spin anisotropy can thus be generated and controlled electrically!
Phys. Rev. Lett. 107, 087202 (2011)
Enhanced Coulomb blockade spectroscopy by adiabatic driving
By adding adiabatically driven, out-of-phase gate and bias potentials to a standard 3-terminal transport measurements additional detailed information can be extracted from the time-averaged current through a quantum dot. An extra current arises solely due to a breaking of the symmetry in time of charging and discharging processes by strong Coulomb interactions (i.e. beyond the mean-field level). Interestingly, this new adiabatic Coulomb blockade spectroscopy allows spin-degeneracies to be detected without a magnetic field!
Phys. Rev. Lett. 104, 226803 (2010)
Nano-science-European Research Area Three-terminal transport through single-molecule magnets,
collaboration with H. van der Zant and A. Cornia.
Contact: M. Wegewijs
DFG-Forschergruppe 912 Coherence and relaxation properties of electron spins, collaboration with C. Meyer.
Kondo effect in single magnetic molecules - article on www.physorg.com