Figure 1

Sketch of the system. (a) Double quantum well (DQW) heterostructure with resonantly coupled electron levels and a hole in the left quantum well (QW). The right QW has a larger bandgap than the left QW tuned by the presence of an indium alloy or the width of the well. (b) Electron-hole bilayer with schematic picture of coupled spatially indirect and direct exciton which form a dipolariton.Reuse & Permissions

Figure 2

Dynamics of the dipolariton system subjected to pulsed optical pumping which shows the oscillations of indirect exciton ($n_{\mathrm{IX}}=|⟨\widehat{c}⟩{|}^2$) and direct exciton ($n_{\mathrm{DX}}=|⟨\widehat{b}⟩{|}^2$) density. The coupling constants are equal to $\hslash J=\hslash \Omega =6\mathrm{meV}$. (a) Oscillations of the density in regime I, where the cavity mode is detuned from direct exciton resonance by ${\delta }_{\Omega }=-10\mathrm{meV}$. Pumping frequency is chosen as $\hslash \Delta =11.5\mathrm{meV}$ and electric field $F=0.95F_0$, where $F_0$ is the field corresponding to IX-DX resonance. The green area schematically represents the optical pulse with a duration $\Delta \tau =1\mathrm{ps}$ (pump, scaled intensity). The inset shows the long-term term oscillations of $n_{\mathrm{IX}}(t)$ and $n_{\mathrm{DX}}(t)$ density which are in antiphase. The period of oscillations is equal to $T=0.65\mathrm{ps}$. (b) Oscillations corresponding to regime II, where detuning is equal to ${\delta }_{\Omega }=3\mathrm{meV}$. For the same electrical field and pump intensity ($\hslash \Delta =0$), the magnitude of the signal is higher comparing to regime I. Inset shows highly damped long-term oscillations in the second regime.Reuse & Permissions

Figure 3

(a) Frequency of indirect exciton density oscillations as a function of a dimensionless electric field calculated for oscillations in regime I (solid line) and regime II (dashed line). (b) Indirect exciton density oscillations calculated for different temperatures of the phonon bath. Parameters correspond to regime I.Reuse & Permissions