Coulomb-blockade spectroscopy on a small quantum dot in a parallel magnetic field

Coulomb-blockade spectroscopy measurements are made on a small GaAs/AlGaAs quantum dot in a magnetic field oriented parallel to the plane of the sampl e. Coulomb-blockade peak motion is observed which can be explained by chang es in the spin of successive ground states as single electrons are added. T he peak movement at low field is consistent with that expected from Zeeman coupling, from which it can be inferred that electrons are not added to the dot in a strictly alternating spin up/spin down manner. (C) 2000 American Institute of Physics. [S0003-6951(00)00840-8].