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Rabi splitting and ac-Stark shift of a charged exciton
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematics of the polarization sensitive detection scheme. Two tunable narrow band lasers provide the pump and the probe beam whose polarizations can be controlled independently. The two beams are coupled into a single mode fiber that guides them into the cryogenic confocal microscope operating at . After the sample, the two transmitted beams are separated by a polarizing beam splitter (PBS) and detected on the two photodetectors PD1 and PD2. The graphs in (b) show the ac-Stark modified spectra measured with the probe beam for different detunings of the pump laser. This was achieved by keeping the pump laser photon energy constant and scanning the probe laser photon energy at different gate voltages. The pump and probe laser powers were and . The spectra have been shifted by an offset relative to 1 for clarity.

Image of FIG. 2.
FIG. 2.

(a) Energy shift of the transmission resonance of the transition of a single QD as a function of the applied gate voltage for zero pump power. The inset shows the excited transition in the QD. (b) The measured resonance energies obtained by sweeping the probe photon energy while the strong pump laser photon energy is kept constant (horizontal line) are plotted as a function of the gate voltage. The gray line corresponds to the transition shown in (a). The dotted and dashed lines are a simple anticrossing behavior as expected from 1. The inset indicates the pump (black arrows) and probe (dotted and dashed arrow) transitions.

Image of FIG. 3.
FIG. 3.

(a) The probe laser transmission spectra with pump laser on resonance, with increasing power (values in the figure in nW), as a function of the detuning between the probe and the pump laser photon energy. The spectra have been shifted vertically for clarity and are fitted by two Lorentzian resonances. (b) Splitting of the resonance measured with the probe laser as a function of the square root of the pump laser power (black) and the measured linewidth of the pump laser absorption spectrum (gray open circles). The splitting follows a linear behavior (black line), while the power broadening can be described by formula (2) (gray line).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Rabi splitting and ac-Stark shift of a charged exciton