In this paper an attempt is made to study the thermoelectric power in quantum dots of non-parabolic semiconductors in the presence of a parallel magnetic field on the basis of a new electron dispersion law. It is found, taking Hg1 - xCdxTe and In 1 - xGaxAsyP1 - y lattice matched to InP as examples, that the thermoelectric power exhibits strong oscillatory dependencies with increasing magnetic field, alloy composition and thickness of the quantum dots, respectively. The thermopower increases with decreasing electron concentration and the numerical values of the same power in quaternary materials are greater in comparison with ternary compounds. © 1995.

K P GHATAK

B NAG

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

A simple theoretical analysis of the thermo-electric power in quantum dots of nonparabolic semiconductors in the presence of a parallel magnetic field

Nanostructured Materials

In this paper we study the influence of strong electric field on the two dimensional magneto thermoelectric power (2D MTP) in ultrathin films (UFs) of III-V, ternary and quaternary semiconductors within the framework of k 'p formalism by formulating a new electron energy spectrum. It appears, taking UFs of InSb, InAs, Hg1-xCdxTe and In1-xGaxAs1-yPy lattice matched to InP as examples, that the 2D MTP increases with increasing film thickness, decreasing surface electron concentration and increasing electric field exhibiting quantum jumps because of the crossing over of the Fermi level by the quantized level in UFs and the quantized oscillation occurs when the Fermi energy touches the sub-band energy. The MTP increases with increasing alloy composition where the variations are totally band structure dependent. Under certain limiting conditions all the results for all the cases get simplified into the well-known classical result and thus confirming the compatibility test. The content of this paper finds three applications in the domain of nano-science and nano technology. Copyright © 2017 American Scientific Publishers All rights reserved.

Journal of Nanoscience and Nanotechnology

The two dimensional magneto thermo power in ultra thin films under intense electric field

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 spinorbit constants within the framework of k.p formalism by incorporating the influence of the crystal field splitting. The corresponding results for IIIV materials form a special case of our generalized analysis under certain limiting conditions. The TP in QWs of Bismuth, IIVI, IVVI 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. © 2010 Elsevier Ltd. All rights reserved.

Superlattices and Microstructures

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

In this paper, we study the thermoelectric power under strong magnetic field (TPSM) in quantum dots (QDs) of nonlinear optical, III-V, II-VI, GaP, Ge, Te, Graphite, PtSb2, zerogap, Lead Germanium Telluride, GaSb, stressed materials, Bismuth, IV-VI, II-V, Zinc and Cadmium diphosphides, Bi 2Te3 and Antimony respectively. The TPSM in III-V, ll-VI, IV-VI, HgTe/CdTe quantum well superlattices with graded interfaces and effective mass superlattices of the same materials together with the quantum dots of aforementioned superlattices have also been investigated in this context on the basis of respective carrier dispersion laws. It has been found that the TPSM for the said quantum dots oscillates with increasing thickness and decreases with increasing electron concentration in various manners and oscillates with film thickness, inverse quantizing magnetic field and impurity concentration for all types of superlattices with two entirely different signatures of quantization as appropriate in respective cases of the aforementioned quantized structures. The well known expression of the TPSM for wide-gap materials has been obtained as special case for our generalized analysis under certain limiting condition, and this compatibility is an indirect test of our generalized formalism. Besides, we have suggested the experimental method of determining the carrier contribution to elastic constants for nanostructured materials having arbitrary dispersion laws. Copyright © 2009 American Scientific Publishers All rights reserved.

Journal of Computational and Theoretical Nanoscience

Thermoelectric power under strong magnetic field in quantum dots and quantized superlattices: Simplified theory and relative comparison

physica status solidi (b)

A Simple Analysis of the Thermoelectric Power in Ultrathin Bismuth Films under Magnetic Quantization

The Einstein relation in ultrathin films of non-parabolic semiconductors under magnetic quantization

Il Nuovo Cimento D

Thermoelectric power in superlattices of nonparabolic semiconductors with graded interfaces under magnetic quantization

Nonlinear Optics II

Photoemission from quantum-confined structure of nonlinear optical materials

Journal of Applied Physics

On the photoemission from quantum‐confined Kane‐type semiconductors

Journal	Nanostructured Materials
Publisher	-
ISSN	0965-9773