Figure 6.

(a) Simulated mean photon energy of the TE (solid) and TM (dashed) emission. The crosses show the mean photon energy calculated from the measured spectra. (b) Simulated degree of polarisation DoP$=(P_{\mathrm{TE}}-P_{\mathrm{TM}})/(P_{\mathrm{TE}}+P_{\mathrm{TM}})$. All data are shown for the current density $j=50$ A cm${}^{-2}$ versus the quantum well width $d_{\mathrm{QW}}$ varying the IHB energy $\sigma$. The experimentally observed mean photon energy can be explained with an IHB energy between 125 meV $\le \sigma \le$ 150 meV.