Addition spectrum of a lateral dot from Coulomb and spin-blockade spectroscopy

Transport measurements are presented on a class of electrostatically define d lateral dots within a high mobility two-dimensional electron gas (2DEG). The design allows Coulomb blockade (CB) measurements to be performed on a s ingle lateral dot containing 0, 1 to over 50 electrons. The CB measurements are enhanced by the spin polarized injection from and into 2DEG magnetic e dge states. This combines the measurement of charge with the measurement of spin through spin-blockade spectroscopy. The results of Coulomb and spin-b lockade spectroscopy for the first 45 electrons enable us to construct the addition spectrum of a lateral device. We also demonstrate that a lateral d ot containing a single electron is an effective local probe of a 2DEG edge.