Regensburg 2004 – scientific programme
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HL: Halbleiterphysik
HL 44: Poster II
HL 44.60: Poster
Thursday, March 11, 2004, 16:30–19:00, Poster A
Thermoelectric Properties of Disordered Systems — •A. Croy1, R.A. Römer2, A. MacKinnon3, and M. Schreiber1 — 1Institut für Physik, Technische Universität Chemnitz, 09107 Chemnitz, Germany — 2Dept. of Physics & Centre for Scientific Computing, University of Warwick, Coventry CV4 7AL, UK — 3Blackett Laboratory, Imperial College London, London SW7 2BW, UK
The electronic properties of disordered systems have been the subject of intense study for several decades. Thermoelectric properties, such as thermopower and thermal conductivity, have been relatively neglected. Based on the recursive Green’s function method [1] and the Chester-Thellung-Kubo-Greenwood formula [2] we have developed an algorithm for calculating all kinetic coefficients Lij on long strips or bars [3]. From these we can deduce the electrical conductivity σ, the Seebeck and Peltier coefficients S & Π and the thermal conductivity κ, as well as the Lorenz number L0. We can realize strips or bars with different lattice types, e.g. square, triangular or hexagonal lattices — useful for investigating the properties of nanotubes. We present initial results for 1D, 2D and 3D systems. In 1D we observe a Lorentzian distribution for the thermopower which is modified by the presence of inelastic scattering. This could give rise to non-negligible quantum fluctuations in macroscopic systems at low temperatures.
[1] A. MacKinnon, Z. Phys. B59, 385 (1985)
[2] G. V. Chester, A. Thellung, Proc. Phys. Soc. London 77, 1005 (1961)
[3] R. A. Römer, A. MacKinnon, C. Villagonzalo, J. Phys. Soc. Jpn. 72 Suppl. A, 167–168 (2003)