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Pairing of spin excitations in lateral quantum dots
Marek Korkusiński1, Pawel Hawrylak, Mariusz Ciorga
1Institute for Microstructural Sciences, National Research Council of Canada, Ottawa K1A0R6, Canada.
Physical Review Letters
|December 17, 2004
Abstract:
We demonstrate the existence of correlated electronic states as paired spin excitations of lateral quantum dots in the integer quantum Hall regime. Starting from the spin-singlet filling-factor nu=2 droplet, by increasing the magnetic field we force the electrons to flip spins and increase the spin polarization. We identify the second spin-flip process as one accompanied by correlated, spin depolarized phases, interpreted as pairs of spin excitons. The correlated states are identified experimentally in few-electron lateral quantum dots using high source-drain voltage spectroscopy.