Berlin 2005 – scientific programme
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HL: Halbleiterphysik
HL 57: Poster IIa
HL 57.9: Poster
Tuesday, March 8, 2005, 16:30–19:00, Poster TU E
Thermoelectric Properties of Disordered Systems — •A. Croy1,2, R. A. Römer1, A. MacKinnon3, and M. Schreiber2 — 1Department of Physics & Centre for Scientific Computing, University of Warwick, Coventry CV4 7AL, UK — 2Institut für Physik, Technische Universität, 09107 Chemnitz, Germany — 3Blackett Laboratory, Imperial College London, London SW7 2BW, UK
The electronic properties of disordered systems at the metal-insulator transition (MIT) have been the subject of intense study for several decades. Thermoelectric properties at the MIT, such as thermopower and thermal conductivity, however, have been relatively neglected. Using an extension of the recursive Green’s function method [1,2], we are able to calculate the low temperature behavior of all kinetic coefficients Lij for long strips or bars. From these we can deduce the electrical conductivity σ, the thermopower S and the Peltier coefficient Π and the thermal conductivity κ, as well as the Lorenz number L0. Our method does not rely on any assumptions on the form of the electrical conductivity. We present results for 3D systems and show the influence of the inelastic scattering time parameter, which can be interpreted as a non-trivial energy-scale associated with inelastic (phonon) scattering. This is relevant for the temperature dependence of the kinetic coefficients.
[1] A. MacKinnon, Z. Phys. B59, 385 (1985)
[2] R. A. Römer, A. MacKinnon, C. Villagonzalo, J. Phys. Soc. Jpn. 72 Suppl. A, 167–168 (2003)