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

摘要

Three-dimensional anisotropy of the Lande g-factor and its electricalmodulation are studied for single uncapped InAs self-assembled quantum dots(QDs). The g-factor is evaluated from measurement of inelastic cotunneling viaZeeman substates in the QD for various magnetic field directions. We find thatthe value and anisotropy of the g-factor depends on the type of orbital statewhich arises from the three-dimensional confinement anisotropy of the QDpotential. Furthermore, the g-factor and its anisotropy are electrically tunedby a side-gate which modulates the confining potential.