Coulomb interaction effects in spin-polarized transport

Coulomb interaction effects in spin-polarized transport

We study the effect of the electron-electron interaction on the transport of spin polarized currents in metals and doped semiconductors in the diffusive regime. In addition to well-known screening effects, we identify two additional effects, which depend on many-body correlations and exchange and reduce the spin diffusion constant. The first is the “spin Coulomb drag” an intrinsic friction mech...

Interaction effects in superconductor/quantum spin Hall devices: universal transport signatures and fractional Coulomb blockade

David Aasen,1 Shu-Ping Lee,1, 2 Torsten Karzig,1, 3 and Jason Alicea1, 4 Department of Physics and Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, CA 91125, USA Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada Station Q, Microsoft Research, Santa Barbara, California 93106-6105, USA Walter Burke Institute for Theoretical ...

Spin-polarized transport through a zigzag-edge graphene flake embedded between two armchair nanoribbons electrodes

We study the coherent spin-polarized transport through a zigzag-edge graphene flake (ZGF), using Hubbard model in the nearest neighbor approximation within the framework of the Green function’s technique and Landauer formalism. The system considered consists of electrode/ (ZGF)/electrode, in which the electrodes are chosen to be armchair nanoribbons. The study was performed for two types of ele...

Coulomb interaction in the spin Hall effect

Spin-polarized transport in carbon nanotubes

We present transport measurements of ferromagnetically contacted carbon nanotubes. In both singleand multi-walled nanotube devices, a spin valve effect is observed due to spin-polarized transport. In one single-walled nanotube device, the spin-valve effect is suppressed as the influence of Coulomb charging is observed at around 10 K. To help understand the interplay between the Coulomb charging...