"Spin-dependent transport in armchair carbon nanotubes and graphene nanoribbons" – Niels Bohr Institute - University of Copenhagen

Niels Bohr Institute > Calendar > 2008 > "Spin-dependent transp...

"Spin-dependent transport in armchair carbon nanotubes and graphene nanoribbons"

We investigate linear and nonlinear transport in interacting single-wall carbon nanotubes and graphene nanoribbons that are weakly attached to ferromagnetic leads.

The energy spectrum of the isolated system is obtained by starting from a microscopic model of interacting p_z electrons. Exchange effects resulting from the short range part of the Coulomb interaction are discussed.

Transport through the nanotube/nanoribbon quantum dots is evaluated starting from a reduced density matrix approach, which accounts for an arbitrarily vectored magnetization of the contacts.

We explain several striking features of the current voltage characteristics, as e.g. current suppressions or negative differential conductance, as a result of the correlations between spin states in the quantum dot systems and leads magnetization. Effective exchange field effects are also discussed.

Speaker: Prof. Milena Grifoni, Universität Regensburg, Germany
Place: HCØ, D-317
Time: Friday, Nov. 7, 13:15
Organizer: Jens Paaske