Seebeck effect in dilute two-dimensional electron systems: temperature dependencies of diffusion and phonon-drag thermoelectric powers

2011/06/07 by S. Y. Liu, Liu, S. Y., X. L. Lei +3
Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #cond-mat.mes-hall #cond-mat.mtrl-sci

paper · pdf · doi:10.48550/arxiv.1106.1262

12 pages, 5 figures

arxiv created 2011/06/07 · arxiv updated 2011/06/08

Abstract

Considering screeening of electron scattering interactions in terms of the finite-temperature STLS theory and solving the linearized Boltzmann equation (with no appeal to a relaxation time approximation), we present a theoretical analysis of the low-temperature Seebeck effect in two-dimensional semiconductors with dilute electron densities. We find that the temperature (T) dependencies of the diffusion and phonon-drag thermoelectric powers (S_d and S_g) can no longer be described by the conventional simple power-laws. As temperature increases, |S_d|/T decreases when T\gtrsim 0.1 ε_F (ε_F is the Fermi energy), while |S_g| first increases and then falls, resulting a peak located at a temperature between Bloch-Grüneisen temperature and ε_F.

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