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The Diffusivtty-Mobility Ratio Under Strong Magnetic Field in Small Gap Superlattices with Graded Structures

Published online by Cambridge University Press:  03 September 2012

Kamakhya P. Ghatak  and
Badal De
Kamakhya P. Ghatak
Affiliation:
Department of Electronics and Telecommunication Engineering Faculty of Engineering and technology, University of jadavpur, Calcutta 700032, India
Badal De
Affiliation:
John Brown E and C. Inc, 333 Ludlow Street, P. O. 1422 Connecticut 06902, USA.
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Abstract

In this paper we have studied the Einstein relation for the diffusivity-mobllity ratio (DMR) in small-gap superi at tices (SLS) with graded structures under magnetic quantization by formulating a new dispersion law. It is found, taking inAs/ GaSb SL as an example that the DMR increases in an oscillatory way with increasing carrier degeneracy due to SdH effect. The DMR in SL. is greater than that of the constituent materials. The theoretical results are in agreement with the suggested experimental method of determining the DMR in degenerate materials having arbitrary dispersion laws.

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