Quantum Hall Effect Experiments Using Ballistic Phonons
The intense interest over the last few years in the quantum Hall effect, occuring in the 2-D electron gas (2DEG), has been sustained largely by electronic transport measurements. For example, the prediction of a gap in the spectrum of elementary excitations of the fractionally quantized 2DEG has been tested only via observation of activated conductivity. No spectroscopic measurement of the gap has been made. We outline here a new phonon spectroscopy technique for the study of the 2-D electron gas and present data on the integrally quantized 2DEG.
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