Figure 1

(a) The energy level diagram of a trion state at zero magnetic field. The absorption spectrum of the weak probe (thin arrow) is modified by a strong pump field (thick arrow). (b) The uncoupled atom-field states. (c) Dressed state picture of a two-level system driven by a strong optical field. The energy levels outside the picture are not shown. The energy splitting between the dressed states with the same photon number is $\hslash {\Omega }_R^g$, where ${\Omega }_R^g$ is the generalized Rabi frequency.Reuse & Permissions

Figure 2

The zero of the laser energy scale is 1318.797 meV. (a) Top curve: trion Mollow absorption spectrum at a pump intensity of $95\mathrm{W}/{\mathrm{cm}}^2$ with resonant pumping. Bottom curve: a probe beam absorption spectrum with no pump. Inset: the Rabi splitting of the side bands as a function of the pump intensity. (b) Trion Mollow absorption spectrum with various pump detuning with a fixed pump intensity of $95\mathrm{W}/{\mathrm{cm}}^2$. Two Rabi side bands are clearly observed, where one is the ac-Stark shifted absorption peak and the other shows gain. Inset: the trion linewidth of the one beam absorption spectrum as a function of laser Rabi frequency. It clearly shows the power broadening effect. (c) The spectral position of the Rabi side bands as a function of the pump detuning. We use the trion transition energy as the zero point. The anticrossing feature of the Rabi side bands is demonstrated as the pump is detuned from the red to the blue of the trion transition. (d) The energy separation of the Rabi side bands as a function of the pump detuning. The solid line is the fit.Reuse & Permissions