Abstract
We have investigated anisotropic surface acoustic wave (SAW) scattering from quantum wire arrays as a function of electron concentration and magnetic field, and we have Fermi's golden rule to model the SAW scattering. With the SAW perpendicular to the wires we observe oscillations in the transmitted intensity, reflecting the magnetic depopulation of ID subbands, and this agrees well with the theory. With the SAW parallel to the wires the theory predicts negligible attenuation, and this is confirmed experimentally at low electron concentrations. Surprisingly, at high electron concentrations the SAW attenuation increases sharply in this orientation to the point where it is three times larger than in the unstructured 2DEG. We speculate that this is due to the excitation of intraband 2D plasmon-like modes.
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