Figure 4: Measuring the two-colour spin noise correlator C2(Δω) and homogeneous linewidth γh versus laser intensity and temperature. | Nature Communications

Figure 4: Measuring the two-colour spin noise correlator C2(Δω) and homogeneous linewidth γh versus laser intensity and temperature.

From: Two-colour spin noise spectroscopy and fluctuation correlations reveal homogeneous linewidths within quantum-dot ensembles

Figure 4

(a) C2(Δω) at different probe laser intensities I at 5 K (vertically offset for clarity). (b) The corresponding homogeneous linewidths of the QDs. (c) C2(Δω) at various temperatures (vertically offset). I=150 μW. (d) The extracted homogeneous linewidth γh (red dots). The dotted line is a fit to the data following the model in ref. 12. The error bars represent χ2 uncertainty when fitting the correlator data in a and c to Lorentzians. Also shown is γh determined by nonlinear four-wave mixing measurements of positively charged exciton transitions (blue square) on similar (In,Ga)As QD ensembles at 10 K (ref. 15), and from absorption studies6,30 of hole-doped single QDs (triangle, black square).

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