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Face recognition by fusion of local and global matching scores using DS theory: An evaluation with uni-classifier and multi-classifier paradigm
Electron spin relaxation by nuclei in semiconductor quantum dots
We have studied theoretically the electron spin relaxation in semiconductor
quantum dots via interaction with nuclear spins. The relaxation is shown to be
determined by three processes: (i) -- the precession of the electron spin in
the hyperfine field of the frozen fluctuation of the nuclear spins; (ii) -- the
precession of the nuclear spins in the hyperfine field of the electron; and
(iii) -- the precession of the nuclear spin in the dipole field of its nuclear
neighbors. In external magnetic fields the relaxation of electron spins
directed along the magnetic field is suppressed. Electron spins directed
transverse to the magnetic field relax completely in a time on the order of the
precession period of its spin in the field of the frozen fluctuation of the
nuclear spins. Comparison with experiment shows that the hyperfine interaction
with nuclei may be the dominant mechanism of electron spin relaxation in
quantum dots
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