UNSPECIFIED (1993) MAGNETOTHERMOPOWER IN SILICON MOSFETS. JOURNAL OF PHYSICS-CONDENSED MATTER, 5 (9). pp. 1355-1364. ISSN 0953-8984

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Abstract

The phonon drag and electronic diffusion contributions to the tensor M which determines the heat flux U = M . E is calculated for a two-dimensional electron gas in a perpendicular magnetic field B. The drag component is obtained using Boltzmann transport and diffusion is included using the lowest-order cumulant approximation to describe scattering between Landau states with different orbit centres. The 2D Landau levels have Gaussian model lineshapes with RMS width gamma = CB1/2 which is the only adjustable parameter. At temperature T = 5.02 K, drag dominates the predicted M(yx)(B) values which are in good agreement with new data for Si MOSFETS taking C = 0.6 meV T-1/2. The calculated M(xx) values are in worse accord with the data because the predicted drag contribution M(xx)g is zero. Both M(xx) and M(yx) reveal magneto-oscillations originating from fluctuations in the density of states at the Fermi level. We show that at T = 5.02 K, setting M(xx)g = 0 has little effect on the accuracy of the magnetothermopower S(xx) (B) but yields poor approximations to the off-diagonal term S(yx)(B). At T = 1.47 K, these thermopower components are diffusion-dominated. The predicted values are comparable to experiment although the magneto-oscillations are overemphasized in S(yx) and underestimated in S(xx).

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF PHYSICS-CONDENSED MATTER
Publisher:	IOP PUBLISHING LTD
ISSN:	0953-8984
Date:	1 March 1993
Volume:	5
Number:	9
Number of Pages:	10
Page Range:	pp. 1355-1364
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/21473

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