Optical-phonon-induced frictional drag in coupled two-dimensional electron gases

Ben Yu-Kuang Hu
Phys. Rev. B 57, 12345 – Published 15 May 1998
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Abstract

The role of optical phonons in frictional drag between two adjacent but electrically isolated two-dimensional electron gases is investigated. Since the optical phonons in III-V materials have a considerably larger coupling to electrons than acoustic phonons (which are the dominant drag mechanism at low T and large separations), it might be expected that the optical phonons will contribute a large effect at high temperatures. The two key differences between optical- and acoustic-phonon-mediated drag are (i) the optical-phonon-mediated interlayer interaction is short-ranged due to the negligible group velocity at the Brillouin zone center, and (ii) the typical momentum transfer for an optical-phonon-mediated scattering is relatively large. These considerations make optical-phonon-mediated drag difficult to see in single-subband GaAs systems, but it may be possible to see the effect in double-subband GaAs systems or single-subband quantum wells in a material with a lower effective mass and lower optical-phonon energy, such as InSb.

  • Received 30 July 1997

DOI:https://doi.org/10.1103/PhysRevB.57.12345

©1998 American Physical Society

Authors & Affiliations

Ben Yu-Kuang Hu

  • Mikroelektronik Centret, Bygning 345ø, Danmarks Tekniske Universitet, DK-2800 Lyngby, Denmark

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Issue

Vol. 57, Iss. 19 — 15 May 1998

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