Figure 2

The rescaled polariton energy, \({E}_{n}^{^{\prime} }={E}_{g}(n)/n\) for \(\tilde{\mu }^{\prime} =-\,1\): (a) as a function of \(\tilde{\beta }\) for \(\tilde{{\rm{\Delta }}}=0\); (b) as a function of \(\tilde{{\rm{\Delta }}}\) for \(\tilde{\beta }=\sqrt{2}\). In both (a) and (b) the dotted curve is for n = 1 while the solid blue, brown, yellow and purple curves are for n = 2, 3, 4 and 5 respectively.