Reply to ``Comment on `Inverse exciton series in the optical decay of an excitonic molecule' "

TL;DR

This paper defends previous findings by presenting new experimental evidence of inverse polariton series in CuCl, supporting the biexcitonic origin hypothesis and addressing criticisms about earlier observations in $eta$-ZnP$_2$.

Contribution

It provides the first observation of inverse polariton series from excitonic molecules in CuCl, confirming the biexcitonic origin and clarifying prior claims.

Findings

First observation of inverse polariton series in CuCl

Supports biexcitonic origin of the inverse series

Addresses and refutes prior claims in $eta$-ZnP$_2$

Abstract

As a reply to the Comment by I.S. Gorban {\it et al.} (Phys. Rev. B, preceding paper) we summarize our criticism on their claim of the first observation of the $M$ series in $\beta$-ZnP$_2$. We support our analysis by reporting the first observation of inverse {\it polariton} series from the excitonic molecules selectively generated at ${\bf K}_m \simeq {\bf 0}$ in a CuCl single crystal. This observation and its explanation within the bipolariton model complete our proof of the biexcitonic origin of the inverse series.