» Conférences d’après mars 2011 : nouveau site
Séminaire général du Département de physique
| Spin currents without electric currents Alexey Kavokin (Southampton) 12 mars 2009 |
The spin Hall effect consists in the generation of a spin current perpendicular to the charge current flow. Thirty-five years after its prediction by Dyakonov and Perel, it is in the focus of experimental and theoretical investigations and constitutes one of the most remarkable effects of spintronics. Due to scattering and dephasing in electronic gases, it is difficult to observe and has only been evidenced for the first time a few years ago. Recently, my group has predicted and the group of Alberto Bramati at Laboratoire Kastler-Brossel observed the optical spin Hall effect (OSHE) which consists in a separation in real and momentum space of spin-polarized exciton-polaritons generated by a laser in a semiconductor microcavity. These results show a high potential for the excitonic spintronics, i.e., spintronics without electric currents. The long-lived coherence of exciton-polaritons and their unusual spin properties make them excellent candidates for ultrafast delivery of quantum information over macroscopic distances. In this talk I will address the mechanisms of generation and control over exciton polariton spin currents in semiconductors and discuss the perspectives for excitonic spintronics.
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| Alexey Kavokin (Southampton) University of Southampton, UK. |