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Collective single mode precession of electron spins in a quantum dot ensemble

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 نشر من قبل Alex Greilich
 تاريخ النشر 2008
  مجال البحث فيزياء
والبحث باللغة English
 تأليف A. Greilich




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We show that the spins of all electrons, each confined in a quantum dot of an (In,Ga)As/GaAs dot ensemble, can be driven into a single mode of precession about a magnetic field. This regime is achieved by allowing only a single mode within the electron spin precession spectrum of the ensemble to be synchronized with a train of periodic optical excitation pulses. Under this condition a nuclei induced frequency focusing leads to a shift of all spin precession frequencies into the synchronized mode. The macroscopic magnetic moment of the electron spins that is created in this regime precesses without dephasing.



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