Abstract
Using large wave-vector surface acoustic waves (SAW) to probe the conductivity of 2D electron systems (2DES), our studies have revealed directly the Fermi surface effects of the composite fermion (CF). Geometric resonances of the quasi-particles' cyclotron orbit and the SAW have allowed measurement of the CF Fermi wave-vector. Recent results at larger SAW wave-vectors have demonstrated these geometric resonances at multiple even-denominator filling factors. In addition, these new results expose an apparent inconsistency between the effective mass as measured in simple DC transport experiments and the mass necessary to observe the geometric resonances.
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