Изучено влияние двухфотонных процессов на поглощение в системе экситонов и биэкситонов при двухимпульсном взаимодействии. Показано, что учет двухфотонных процессов приводит к возможности наблюдения несимметричного эффекта Аутлера--Таунса. При определенных величинах падающих полей возможно исчезновение эффекта Аутлера--Таунса, связанное с квантовой интерференцией всех механизмов взаимодействия. Предсказана возможность управления спектром поглощения с помощью изменения интенсивностей полей и расстроек резонанса падающего излучения. Ключевые слова: экситоны, биэкситоны, расщепление Аутлера--Таунса.
The effect of the triexciton state on the absorption of exciton-polaritons is studied under conditions when two high-power laser radiation pulses interacting with biexcitons and triexcitons and a probe pulse at the frequency of the exciton transition are incident on the medium. It is shown that even at low triexciton binding energies under the action of two high-power pulses, the exciton state splits into three quasi-levels, and the Outler-Towns effect (optical Stark effect) is observed. It turned out that the position of the quasi-levels depends on the detuning of the resonance of the pump pulses and their intensities, which makes it possible to identify them. These circumstances make it possible to diagnose the triexciton state in semiconductors with a higher degree of probability not by studying the absorption spectral line of the biexciton-triexciton transition, but by the effect of the triexciton state on absorption in the region of the exciton transition.
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