Exotic exciton–phonon states and bottleneck for self-trapping

Abstract

In a previous paper the conventional barrier model of excitonic self-trapping has been shown to display divergencies. In the present work we report on novel ‘‘exotic’’ exciton–phonon states, which have not been noted so far. These states are of non-self-trapping nature, and by way of their small extension in Q space they may acquire a ‘‘bottleneck’’ role in the process of energy dissipation. This seems to allow for a new explanation of the fast luminescence found in rare gas and other crystals.