Optically detected microwave resonance at 95 GHz of exciton states in InAs/GaAs quantum dots

Optically detected microwave resonance spectra of MBE-grown InAs/GaAs quantum dots (QD) was obsd. The signal is detected via modulation of the total intensity of the QD emission induced by W-band (95 GHz) microwave excitation. ODMR lines are obsd. at higher fields when the static field is either parallel or perpendicular to the growth direction, with hole g-values |gh,.dblvert.| = 3.9 and |gh,.perp.| = 3.0, resp. These broad ODMR lines are tentatively attributed to hole spin transitions. A strongly anisotropic low-field transition is ascribed to cyclotron resonance (CR), corresponding to an effective mass of 0.059 m0