Electrically tunable three-dimensional g-factor anisotropy in single InAs self-assembled quantum dots

Three-dimensional anisotropy of the Lande g factor and its electrical modulation are studied for single uncapped InAs self-assembled quantum dots (QDs). The g factor is evaluated from measurement of inelastic cotunneling via Zeeman substates in the QD for various magnetic field directions. We find that the value and anisotropy of the g factor depends on the type of orbital state which arises from the three-dimensional confinement anisotropy of the QD potential. Furthermore, the g factor and its anisotropy are electrically tuned by a side gate which modulates the confining potential. DOI: 10.1103/PhysRevB.87.161302