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Self-induced acoustic transparency in semiconductor quantum films.

A O Govorov1, A V Kalameitsev, V M Kovalev

  • 1Institute of Semiconductor Physics, Russian Academy of Sciences, Siberian Branch, 630090 Novosibirsk, Russia. govorov@helios.phy.ohiou.edu

Physical Review Letters
|December 12, 2001
PubMed
Summary

We present a quantum theory for surface acoustic waves interacting with electrons in quantum wells. High-intensity acoustic waves lead to dissipationless sound propagation and acoustically transparent quantum films.

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Area of Science:

  • Quantum mechanics
  • Condensed matter physics
  • Acoustics

Background:

  • Understanding electron-acoustic wave interactions is crucial for quantum devices.
  • Nonlinear acoustic effects in quantum systems are not fully explored.

Purpose of the Study:

  • To develop a quantum theory for nonlinear acoustic wave-electron interactions in quantum wells.
  • To investigate sound attenuation and propagation in the quantum nonlinear regime.

Main Methods:

  • Quantum theory development
  • Analysis of nonlinear acoustic wave-electron interactions
  • Investigation of quantum wells with moving quantum wires and dots

Main Results:

  • Sound attenuation exhibits quantum oscillations in the nonlinear regime.

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  • Attenuation dramatically decreases with increasing quantum confinement.
  • Electron dots formed by acoustic waves allow dissipationless wave propagation at high intensities.

    • Conclusions:

    • The electron quantum film behaves as an acoustically quasitransparent material under specific conditions.
    • Quantum effects significantly alter sound attenuation in electron systems.
    • This work opens possibilities for novel acoustic devices in quantum systems.