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SUMMARY:Manipulation of nuclear spins in semiconductor quantum dots using 
                        resonant techniques - Alexander Tartakovskii\, Univ
 ersity of Sheffield
DTSTART:20091127T153000Z
DTEND:20091127T163000Z
UID:TALK19615@talks.cam.ac.uk
CONTACT:Dr Jonathan Keeling
DESCRIPTION:Recent fast advances in device fabrication technology and deve
 lopment of sophisticated\nexperimental techniques enabled major breakthrou
 ghs in manipulation of single spins in\nsemiconductor nano-structures. Thi
 s research has been largely driven by the prospects of spin\napplications 
 in quantum information processing\, for which III-V semiconductor quantum 
 dots\n(QDs) present a very versatile quantum system suitable for both elec
 trical and optical spin\nmanipulation. It has been found that control of t
 he electron spin in a dot requires preparation\nof its magnetic environmen
 t formed by 10^4^-10^5^ host nuclear spins. In my talk I will focus on\nth
 e properties of the nuclear spin nano-systems. I will review our recent wo
 rk on\nmanipulation of nuclear spins in individual quantum dots by resonan
 t optical pumping\, where\nby pumping an optically forbidden transition in
  a dot we achieve the highest degree of\nnuclear spin polarization reporte
 d so far for III-V semiconductor structures. I will also present\nresults 
 of nuclear magnetic resonance (NMR) experiments\, where we employ resonant
  radio\nfrequency excitation to demonstrate Rabi oscillations\, spin-echo 
 and Ramsey fringes in tiny\nensembles of optically controlled nuclear spin
 s in single QDs.  \n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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