Oscillations in the thermal conductivity of a GaAs/AlxGa1-xAs heterostructure in the fractional quantum Hall regime

V. Bayot, M. B. Santos, Mansour Shayegan

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Abstract

We report thermal conductivity (TC) experiments on a high-quality GaAs/AlxGa1-xAs multiple-quantum-well structure in the fractional quantum Hall regime. We observe magneto-oscillations in TC exhibiting maxima at integral as well as at fractional fillings =1/3, 2/3, and 4/3. The results reflect the quasiparticle density of states and demonstrate the absence of gapless excitations in the energy spectrum of the fractional liquid states. At very low temperature, we observe anomalous oscillations in TC which may result from the piezoelectric coupling of the phonons to the two-dimemsional electrons.

Original languageEnglish (US)
Pages (from-to)7240-7243
Number of pages4
JournalPhysical Review B
Volume46
Issue number11
DOIs
StatePublished - Jan 1 1992

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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