Manipulation of nuclear spins in semiconductor quantum dots using resonant techniques

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• Alexander Tartakovskii, University of Sheffield
• Friday 27 November 2009, 15:30-16:30
• TCM Seminar Room, Cavendish Laboratory.

If you have a question about this talk, please contact Dr Jonathan Keeling.

Recent fast advances in device fabrication technology and development of sophisticated experimental techniques enabled major breakthroughs in manipulation of single spins in semiconductor nano-structures. This research has been largely driven by the prospects of spin applications in quantum information processing, for which III -V semiconductor quantum dots (QDs) present a very versatile quantum system suitable for both electrical and optical spin manipulation. It has been found that control of the electron spin in a dot requires preparation of its magnetic environment formed by 10⁴-10⁵ host nuclear spins. In my talk I will focus on the properties of the nuclear spin nano-systems. I will review our recent work on manipulation of nuclear spins in individual quantum dots by resonant optical pumping, where by pumping an optically forbidden transition in a dot we achieve the highest degree of nuclear spin polarization reported so far for III -V semiconductor structures. I will also present results of nuclear magnetic resonance (NMR) experiments, where we employ resonant radio frequency excitation to demonstrate Rabi oscillations, spin-echo and Ramsey fringes in tiny ensembles of optically controlled nuclear spins in single QDs.

This talk is part of the TCM Informal Seminar Series series.

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• TCM Seminar Room, Cavendish Laboratory

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