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Femtosecond Quantum Beats in Excitons of a Layered Semiconductor BiI3

T. Tokizaki, A. Nakamura, Y. Ishida, T. Yajima, I. Akai, and T. Karasawa

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Abstract

In recent years, ultrafast relaxation processes of excitons in solids have been widely studied with the development of femtosecond lasers and measuring technique. With a coherent transient spectroscopy we can measure not only the optical dephasing of excited states but also quantum beats among some states in multilevel systems. Interference beats were observed with a degenerate four-wave mixing (DFWM) for atomic Rb vapor[1]. However, such a coherent transient phenomenon has not been observed, to author's knowledge, for semiconductors.

© 1990 Optical Society of America

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