OBSERVATION OF SPIN SPLITTING IN SINGLE INAS SELF-ASSEMBLED QUANTUM DOTS IN ALAS

Using magneto-tunneling spectroscopy, we observe the Zeeman spin split ting of the ground state of a single InAs. quantum dot grown within Al As. We obtain values for the g factor of different quantum dots betwee n + 0.52+/-0.08 and + 1.6 +/- 0.2, with magnetic field applied in the plant of the dot. This value for the g factor is considerably differen t from that of bulk InAs (g = - 14.8), and we explain this using a sim ple three band k.p calculation. Using the spin split states of the dot as a probe, we observe the complete spin polarization of the emitter accumulation layer. (C) 1998 American Institute of Physics.