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The dephasing of coherent phonons in semimetals and semiconductors is studied using nondegenerate excitation and probing by femtosecond laser pulses. The dependences of the lifetimes of phonons of various symmetries… Click to show full abstract
The dephasing of coherent phonons in semimetals and semiconductors is studied using nondegenerate excitation and probing by femtosecond laser pulses. The dependences of the lifetimes of phonons of various symmetries on the exciting-pulse duration, the crystal temperature, and the coherent amplitude, which are determined by coherent control and the exciting-pulse duration, are investigated. These dependences demonstrate that the dephasing of coherent phonons in a linear mode is controlled by the state of environment (reservoir), which is taken to be the set of lattice and electronic states not involved in coherent motion.
Journal Title: Journal of Experimental and Theoretical Physics
Year Published: 2019
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