Hanle effect in transport through quantum dots coupled to ferromagnetic leadsM. Braun1, J. König1 and J. Martinek2, 3, 4
1 Institut für Theoretische Physik III, Ruhr-Universität Bochum 44780 Bochum, Germany
2 Institut für Theoretische Festkörperphysik, Universität Karlsruhe 76128 Karlsruhe, Germany
3 Institute of Molecular Physics, Polish Academy of Science - 60-179 Poznan, Poland
4 Institute for Materials Research, Tohoku University - Sendai 980-8577, Japan
received 19 April 2005; accepted in final form 22 August 2005
published online 14 September 2005
We suggest a series of transport experiments on spin precession in quantum dots coupled to one or two ferromagnetic leads. A finite dot-spin polarization is created by spin injection and analyzed via the linear conductance through the dot, while an applied magnetic field gives rise to the Hanle effect. Such a Hanle experiment can be used to determine the spin lifetime in the quantum dot, to measure the spin injection efficiency into the dot, as well as proving the existence of intrinsic spin precession which is driven by the Coulomb interaction.
85.75.-d - Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields.
73.63.Kv - Quantum dots.
73.23.Hk - Coulomb blockade; single-electron tunneling.
© EDP Sciences 2005