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The Photoemission from Quantum Wells, Wires and Carbon Nanotubes:Simplified Theory and Relative Comparison

Kumar, A and Chowdhury, S and Adhikari, SM and Ghosh, S and Mitra, M and De, D and Sharma, A and Bhattacharya, S and Dey, A and Ghatak, KP (2010) The Photoemission from Quantum Wells, Wires and Carbon Nanotubes:Simplified Theory and Relative Comparison. In: Journal of Computational and Theoretical Nanoscience, 7 (1). pp. 115-145.

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We investigate the photoemission from quantum wells (QWs) in ultrathin films (UFs) and quantum well wires (QWWs) of non-linear optical materials on the basis of a newly formulated electron dispersion law considering the anisotropies of the effective electron masses, the spin-orbit splitting constants and the presence of the crystal field splitting within the framework of k.p formalism. The results of quantum confined Ill-V compounds form the special cases of our generalized analysis. The photoemission has also been studied for quantum confined II-VI, n-GaP, n-Ge, PtSb2, stressed materials and Bismuth on the basis of respective dispersion relations. It has been found taking quantum confined CdGeAS(2), InAs, InSb, CdS, GaP, Ge, PtSb2, stressed n-InSb and B1 that the photoemission exhibits quantized variations with the incident photon energy, changing electron concentration and film thickness, respectively, for all types of quantum confinement. The photoemission from CNs exhibits oscillatory dependence with increasing normalized electron degeneracy and the signature of the entirely different types of quantum systems are evident from the plots. Besides, under certain special conditions, all the results for all the materials gets simplified to the well-known expression of photoemission from non-degenerate semiconductors and parabolic energy bands, leading to the compatibility test.

Item Type: Journal Article
Publication: Journal of Computational and Theoretical Nanoscience
Publisher: American Scientific Publishers.
Additional Information: Copyright of this article belongs to American Scientific Publishers.
Keywords: Quantum Wells;Quantum Wires;Photoemission;Non-Linear Optical Materials;Platinum Antimonide;II-VI Compounds
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited: 29 Mar 2010 11:19
Last Modified: 29 Feb 2012 06:23
URI: http://eprints.iisc.ac.in/id/eprint/26651

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