University of Birmingham > Talks@bham > Theoretical Physics Seminars > Spin-dependent transport in reduced dimensions

Spin-dependent transport in reduced dimensions

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  • UserDr Martin Gradhand, UoBristol
  • ClockThursday 13 February 2014, 13:45-15:00
  • HouseTheory Library.

If you have a question about this talk, please contact Kevin Ralley.

Since several years, various applications make use of the giant and tunnelling magnetoresistance, the classical examples of spin-dependent electronic transport including ferromagnets. More recently, spin-orbit coupling came into the focus due to its potential to generate spin currents in nominally nonmagnetic materials. One example among a large class is the spin Hall effect, the nonmagnetic analogue to the anomalous Hall effect.

In my talk I will review our approach to describe spin-orbit driven spin-dependent transport focussing on the effect of reduced dimensions. While the spin Hall effect will be discussed in the light of generating spin currents, I will approach the problem of spin relaxation as well. Fortunately to us and unfortunately for many applications both are partially driven by the same mechanism: the scattering at impurities.

As examples I will highlight metallic thin films as well as single layer graphene. In both cases the reduced dimensions introduce new aspects in the spin dependent scattering. Especially for graphene I will show that a particular choice of impurities may account for the surprisingly short spin relaxation time found experimentally.

This talk is part of the Theoretical Physics Seminars series.

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