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On the two-dimensional thermoelectric power in quantum wells of non-parabolic materials under magnetic quantization

Bhattacharya, S and Choudhury, S and Ghatak, KP (2010) On the two-dimensional thermoelectric power in quantum wells of non-parabolic materials under magnetic quantization. In: Superlattices and Microstructures, 48 (3). pp. 257-275.

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Official URL: http://dx.doi.org/10.1016/j.spmi.2010.06.010

Abstract

We present a simplified theoretical formulation of the thermoelectric power (TP) under magnetic quantization in quantum wells (QWs) of nonlinear optical materials on the basis of a newly formulated magneto-dispersion law. We consider the anisotropies in the effective electron masses and the spin-orbit constants within the framework of k.p formalism by incorporating the influence of the crystal field splitting. The corresponding results for III-V materials form a special case of our generalized analysis under certain limiting conditions. The TP in QWs of Bismuth, II-VI, IV-VI and stressed materials has been studied by formulating appropriate electron magneto-dispersion laws. We also address the fact that the TP exhibits composite oscillations with a varying quantizing magnetic field in QWs of n-Cd3As2, n-CdGeAs2, n-InSb, p-CdS, stressed InSb, PbTe and Bismuth. This reflects the combined signatures of magnetic and spatial quantizations of the carriers in such structures. The TP also decreases with increasing electron statistics and under the condition of non-degeneracy, all the results as derived in this paper get transformed into the well-known classical equation of TP and thus confirming the compatibility test. We have also suggested an experimental method of determining the elastic constants in such systems with arbitrary carrier energy spectra from the known value of the TP. (C) 2010 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Thermoelectric power; Quantizing magnetic field; Quantum wells.
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly, (CEDT) Centre for Electronic Design & Technology)
Date Deposited: 18 Oct 2010 07:40
Last Modified: 18 Oct 2010 07:40
URI: http://eprints.iisc.ernet.in/id/eprint/33118

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