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

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

2008-11-11

arxiv.org/abs/0811.1783v1

Phys. Rev. B 79, 201305(R) (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

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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