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HL: Halbleiterphysik

HL 11: Poster 1

HL 11.31: Poster

Monday, March 11, 2002, 17:00–19:30, Poster A

Heat conduction of superlattices at low temperatures — •Andriy Tutov¹, Michael Schmitt², Andreas Mayer¹, and Dieter Strauch¹ — ¹Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg — ²DaimlerChrysler Aerospace, D-88039 Friedrichshafen

The thermal conductivity of superlattices is investigated in a temperature regime where the phonon mean free path is larger than the layer spacings. The Peierls collision operator in the phonon Boltzmann equation is evaluated for isotope scattering and compositional disorder at the interfaces. The acoustic phonon modes of the superlattice are determined within the continuum approximation, and the thermal conductivity is calculated in the Ziman limit. The influence of phonon scattering from the boundaries of the sample and of mini-Umklapp processes is taken into account. Numerical results for the thermal conductivity of GaAs/AlAs superlattices (relatively small acoustic mismatch) are compared with corresponding data obtained for Al/W systems (large acoustic mismatch).