Pairing of spin excitations in lateral quantum dots.
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.
Korkusiński
Marek
M
Institute for Microstructural Sciences, National Research Council of Canada, Ottawa K1A0R6, Canada.
Hawrylak
Pawel
P
Ciorga
Mariusz
M
Pioro-Ladrière
Michel
M
Sachrajda
Andrew S
AS