An attempt is made to formulate the generalized carrier statistics in superlattice structures of small‐gap semiconductors by deriving expressions for the density‐of‐states function and the carrier concentration in such structures in the presence of a quantizing magnetic field. The corresponding expressions for superlattices of large‐gap semiconductors can easily be obtained from the generalized relations derived. These results would be more general than those reported in the literature for such structures of large‐gap semiconductors on the basis of tight‐binding approximations. Copyright © 1983 WILEY‐VCH Verlag GmbH & Co. KGaA

K P GHATAK

A N CHAKRAVARTI

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

physica status solidi (b)

We study the energy spectrum of the conduction electrons and the corresponding density-of-states (DOS) in heavily doped compound semiconductors forming band-tails. It is found, taking Hg1-xCdx Te as an example, that the complex nature of the energy spectrum, the oscillatory DOS for negative values of the energy and the formation of a new forbidden zone is due to interaction of the impurity atoms in the tail with the spin-orbit splitting constant of the valence band. No oscillations in the DOS are found for heavily doped two-band Kane type and parabolic energy bands, respectively. The well-known results have also been obtained from our generalized derivation under certain limiting conditions. © 2001 Elsevier Science B.V. All rights reserved.

Physics Letters, Section A: General, Atomic and Solid State Physics

On the density-of-states function in heavily doped compound semiconductors

The Einstein relation for the diffusivity-mobility ratio of the carriers in semiconductors (hereeafter referred to as DMR) is a very important one, since by being a thermo-dynamic relation this is independent of any scattering mechanisms and also since one can determine the diffusivity from this relation by knowing the mobility and vice-versa. besides, the simplest method of analyzing semiconductor devices taking into account the degeneracy of the bands is to use the DMR to express the performance at the device terminals and the switching speed in terms of carrier concentration. © 1987 SPIE.

Journal	physica status solidi (b)
Publisher	-
ISSN	0370-1972