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Monday, May 13th 2019

10:00 am:

The spin Hall effect (SHE) was predicted nearly half a century ago [1, 2]. Following the proposal in [3], the (inverse) SHE was experimentally observed for the first time in [4], without arousing much interest. The first experimental observations of the (direct) SHE were reported [5, 6] more than 30 years after the original prediction, causing great excitement and many theoretical and experimental studies of this phenomenon.

The spin current density is described by a tensor qij, where the first index corresponds to the direction of flow, and the second one - to the component of the spin that is flowing.

The spin-orbit interaction provides coupling between the spin and charge currents, so that a charge current in the z direction produces the xy component of the spin current, resulting in spin accumulation at the lateral surfaces of the sample (direct spin Hall effect). In turn, the xy component of the spin current induces the z component of the charge current resulting in the change of the sample resistance (inverse spin Hall effect).

Related phenomena are the spin Hall magnetoresistance [7, 8] and the effect of swapping spin currents, which was predicted theoretically [9] but so far not yet observed experimentally.

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