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Soviet Journal of Quantum Electronics

Possible observations of explosive absorption in CuCl under conditions of resonant formation of biexcitons

A. L. Gyulamiryan, Kh. V. Nerkararyan

Published Apr 30, 1988• 0 citations
Publisher

Abstract

The absorption of an electromagnetic wave caused by a resonant transition from an exciton state to a biexciton state in a CuCl crystal is discussed. It is found that the absorption coefficient may increase anomalously when an exciton molecule decays. This is a threshold process and is observed only above a specific incident wave intensity.

DOI
10.1070/qe1988v018n04abeh011777

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The absorption of an electromagnetic wave caused by a resonant transition from an exciton state to a biexciton state in a CuCl crystal is discussed. It is found that the absorption coefficient may increase anomalously when an exciton molecule decays. This is a threshold process and is observed only above a specific incident wave intensity.
We measured the optical transitions due to the internal energy levels of an exciton and biexciton in a CuCl single crystal using pump-probe spectroscopy. The transient absorption bands due to the transitions from the 1s1s1s to 2p2p2p and from the 1s1s1s to 3p3p3p exciton states were observed at 3 K, which is consistent with their reported energies. Simultaneously, the transient absorption peak due to the biexciton was observed, which corresponds to a transition from the lowest state (composed of two 1s1s1s excitons) to higher states (composed of 1s1s1s and 2p2p2p excitons). The value of the observed biexciton peak energy was reasonable considering the hydrogen molecule orbitals and the electron-to-hole effective mass ratio. In addition, the transient absorption peaks were broadened at 77 K, because of the increase in the homogeneous width of the 2p2p2p exciton state. The transient absorption spectrum was almost completely determined by this width. Our findings are of importance with regard to the optical phenomena in the infrared region related to the quantum coherence of excitons and biexcitons in semiconductors.
Abstract Phonon‐assisted two‐photon absorption of biexcitonic levels in CuCl is considered including damping of the nearly resonant excitonic intermediate state. A pronounced structure of the line shape due to resonance effects, threshold effects, and structure in the Fourier transform of the envelope of the excitonic molecule is predicted. A detailed discussion of both temperature and damping effects is given. Large cross sections are predicted. The most favourable energetic range to observe the effects derived here is the low energy tail of the line, on the left of the Γ⅕ exeiton.
Abstract The induced absorption due to exciton‐biexciton transitions is observed in CuCl with an experimental set‐up using two dye lasers. The shape of the absorption band is studied. The oscillator strength per exciton of this absorption is estimated and compared to theoretical evaluations. The excitation spectrum of this induced absorption is also measured and its features are tentatively explained by the existence of a superficial layer on the samples, where excitons have a very short lifetime.