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Manipulation of nuclear spins in semiconductor quantum dots using resonant techniques

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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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