Ballistic phonon interactions with the fractional quantum Hall effect liquid

Ballistic phonon experiments, in the fractional quantum Hall regime, are described in which the interactions between the longitudinal (LA) and transverse acoustic (TA) modes and the two-dimensional electron system (2DES) can be resolved. The range of in-plane wave vectors of LA phonons that can inte...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2002-05, Vol.316, p.101-106
Main Authors: Devitt, A.M., Roshko, S.H., Kent, A.J., Benedict, K.A., Mellor, C.J., Henini, M.
Format: Article
Language:English
Subjects:
Fractional quantum hall effect
Heat capacity
Spectroscopy
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Summary:Ballistic phonon experiments, in the fractional quantum Hall regime, are described in which the interactions between the longitudinal (LA) and transverse acoustic (TA) modes and the two-dimensional electron system (2DES) can be resolved. The range of in-plane wave vectors of LA phonons that can interact with the 2DES is restricted and the measured fractional quantum Hall energy gap is found to depend on the in-plane wave vector. Whilst the energies found at Landau level filling factor ν= 2 5 are in good agreement with theory, those at ν= 2 3 and 1 3 are lower than theoretical predictions. Possible reasons for this discrepancy are discussed.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(02)00432-5