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Magneto-oscillations of thermal conductance observed recently by Eisenstein, Gossard, and Narayanamurti in GaAs/AlxGa1-xAs heterostructures at low temperatures are studied theoretically. We calculate the thermal-phonon lifetime limited by the scattering with Landau-quantized electrons at high magnetic fields. The calculation includes (i) both piezoelectric and deformation-potential couplings as the sources of electron-phonon interaction, (ii) Landau-level broadening with a Gaussian profile function, and (iii) magnetic-field-dependent screening effects. The results are compared favorably with the experimental data. In particular, the screening effects are crucial to explain both the magnetic field and temperature dependences of the observed thermal conductance

physical review. b, condensed matter

Two-dimensional electron<i>–</i>acoustic-phonon interaction at high magnetic fields: Thermal conductance in GaAs/<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Al</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ga</…

Two-dimensional electron–acoustic-phonon interaction at high magnetic fields: Thermal conductance in GaAs/AlxGa