Investigation of the dependence of the coherent dynamics of a bismuth lattice on the crystal excitation level |
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Authors: | O V Misochko and M V Lebedev |
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Institution: | (1) Research Inst. of Electrical Communication, Tohoku University, Sendai, Japan;(2) Research Center for Integrated Quantum Electronics, Hokkaido University, Sapporo, Japan;(3) University of Montpellier & Centre National de la Recherche Scientifique, Montpellier, France;(4) Computational Nano-Electronics Laboratory, University of Aizu, Aizu-Wakamatsu, Japan |
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Abstract: | Fully symmetric coherent phonons in bismuth have been investigated in a wide range of pumppulse energies by the pump-probe
method using femtosecond laser pulses. It has been shown that in the linear regime, which is implemented only for low pump
intensities, the coherent amplitude is proportional to the pump intensity, whereas the relaxation rate of the coherent state
and its frequency remain unchanged. In the nonlinear regime, which can be divided into superlinear and sublinear regions,
the relaxation rate of a photoinduced lattice state can be approximated by a two-component response, where only one component
depends strongly on the pump intensity. The nature of the coherence of the phonon subsystem, which is created by an ultrashort
laser pulse, is discussed on the basis of the analysis of the data. |
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Keywords: | |
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