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Nonequilibrium phonons in SiGe quantum-well nanostructures upon excitation by picosecond laser pulses

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Abstract

The phonon pulses initiated by photoexcitation of structures containing Si0.8Ge0.2 double quantum wells under picosecond radiation of a MIRA 900P titanium-sapphire laser (λ = 760 nm) are studied. The propagation of nonequilibrium acoustic phonons is detected with a superconducting bolometer. The recorded bolometer response is found to differ substantially from that observed in photoexcitation of the same structure by nanosecond pulses of a nitrogen laser (λ = 337 nm). The generation of coherent acoustic phonons is suggested as an explanation.

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Authors and Affiliations

  1. Lebedev Physical Institute, Russian Academy of Sciences, Leninskiĭ pr. 53, Moscow, 119991, Russia

    A. I. Sharkov, A. Yu. Klokov, T. I. Galkina & V. A. Tsvetkov

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  1. A. I. Sharkov
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  2. A. Yu. Klokov
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  3. T. I. Galkina
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  4. V. A. Tsvetkov
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Corresponding author

Correspondence to A. I. Sharkov.

Additional information

Original Russian Text © A.I. Sharkov, A.Yu. Klokov, T.I. Galkina, V.A. Tsvetkov, 2008, published in Fizika Tverdogo Tela, 2008, Vol. 50, No. 8, pp. 1359–1361.

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Sharkov, A.I., Klokov, A.Y., Galkina, T.I. et al. Nonequilibrium phonons in SiGe quantum-well nanostructures upon excitation by picosecond laser pulses. Phys. Solid State 50, 1412–1414 (2008). https://doi.org/10.1134/S1063783408080040

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  • DOI: https://doi.org/10.1134/S1063783408080040

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