Ultrahigh-frequency surface acoustic waves for finite wave-vector spectroscopy of two-dimensional electrons

Kukushkin, I. V.; Smet, J. H.; Höppel, L.; Waizmann, U.; Riek, M.; Wegscheider, W.; von Klitzing, K.
November 2004
Applied Physics Letters;11/8/2004, Vol. 85 Issue 19, p4526
Academic Journal
Ultrahigh-frequency (up to 24 GHz) surface acoustic waves were excited with short-period interdigital transducers and detected in GaAs/AlGaAs quantum wells with an optical scheme. We demonstrate that the transducers can be driven in a contactless fashion. Sets of two transducers permitted the coherent emission of surface acoustic waves and the creation of standing waves due to interference. The methods described offer bright prospects for finite wave-vector spectroscopy of two-dimensional electrons in a noninvasive way up to wave numbers of 106 cm-1.


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