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(a) PL of photonic crystal cavity showing a Q of 9000. A scanning electron microscope image of a typical fabricated L3 cavity is shown in the inset. (b) Single QD emission is split into and exciton branches by an applied magnetic field in the absence of any cavity. The dotted line and dashed line show calculated fits.
Strong coupling of exciton spin states to a cavity mode. (a) Magnetic field tuning when sample is held at 34 K (QD is blueshifted from cavity) and exciton emission is shifted onto cavity resonance. (b) Magnetic field tuning when sample is held at 41 K (QD is redshifted from cavity) and exciton emission is blueshifted onto cavity resonance. Right panels show measured spectra from 1.5 to 3.3 T (0.3 T steps) for exciton state and 1.8 to 3.6 T for exciton state.
(a) Spectra of coupled QD-cavity mode with temperature scanning at 0 T (top) and 1 T (bottom): the QD exciton emission redshifts and crosses the cavity mode as temperature increases. The minimum energy separation is indicated at the anticrossing point. (b) Measured Rabi frequency based on the minimum energy separation: coupling strength at 0 T is indicated by a triangle and exciton coupling constants are indicated by circles (rectangles).
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