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- W1998045555 abstract "The interaction between a surface acoustic wave (SAW) of wave number $k$ and frequency $ensuremath{omega}$ and a two-dimensional electron gas in a piezoelectric semiconductor can be expressed in terms of the longitudinal conductivity ${ensuremath{sigma}}_{mathrm{xx}}(k,ensuremath{omega})$ and an effective electromechanical coupling coefficient. The resulting velocity change and the attenuation of the transmitted SAW intensity are well known. In a recent paper, Simon [Phys. Rev. B 54, 13 878 (1996)] calculated the fractional energy change $ensuremath{Delta}U/U$ for a SAW interacting with a two-dimensional sheet embedded in a semi-infinite piezoelectric material and obtained a relationship with the results for the attenuation coefficient and the fractional velocity change. In this paper, $ensuremath{Delta}U/U$ is calculated for a narrow channel of width ${r}_{ensuremath{perp}}$ ${(kr}_{ensuremath{perp}}ensuremath{ll}1)$ at a distance $d$ below the surface of a slab of piezoelectric material of finite thickness when an elastic wave is launched on the surface. $ensuremath{Delta}U/U$ is given as a closed-form expression in terms of the velocity of the elastic wave, the elastic constants, and the piezoelectric tensor. Numerical results are presented for $ensuremath{Delta}U/U$ as a function of $mathrm{kd}$ for several values of the thickness of a slab of ${mathrm{G}mathrm{a}mathrm{A}mathrm{s}/mathrm{A}mathrm{l}}_{x}{mathrm{Ga}}_{1ensuremath{-}x}mathrm{As}$." @default.
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- W1998045555 date "1998-01-15" @default.
- W1998045555 modified "2023-09-28" @default.
- W1998045555 title "Interaction of surface acoustic waves with a narrow electron channel in a piezoelectric material" @default.
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- W1998045555 doi "https://doi.org/10.1103/physrevb.57.1654" @default.
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