Photoemission from quantum-confined structure of nonlinear optical materials

Ghatak, K. P.; Ghoshal, A.; Biswas, Subrata

doi:10.1117/12.43565

Cited by 7 publications

(4 citation statements)

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“…The electron concentration in this case is given by 31 is the totally quantized energy which can be obtained by substituting in (15) …”

Section: The Ep From Iv-vi Quantum Dot Hd Superlattices With Graded Imentioning

confidence: 99%

Einstein’s Photoemission from Quantum Confined Superlattices

Debbarma¹,

Kp²

2016

j nanosci nanotechnol

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This paper is dedicated to the 83th Birthday of Late Professor B. R. Nag, D.Sc., formerly Head of the Departments of Radio Physics and Electronics and Electronic Science of the University of Calcutta, a firm believer of the concept of theoretical minimum of Landau and an internationally well known semiconductor physicist, to whom the second author remains ever grateful as a student and research worker from 1974-2004. In this paper, an attempt is made to study, the Einstein's photoemission (EP) from III-V, II-VI, IV-VI, HgTe/CdTe and strained layer quantum well heavily doped superlattices (QWHDSLs) with graded interfaces in the presence of quantizing magnetic field on the basis of newly formulated electron dispersion relations within the frame work of k · p formalism. The EP from III-V, II-VI, IV-VI, HgTe/CdTe and strained layer quantum wells of heavily doped effective mass superlattices respectively has been presented under magnetic quantization. Besides the said emissions, from the quantum dots of the aforementioned heavily doped SLs have further investigated for the purpose of comparison and complete investigation in the context of EP from quantum confined superlattices. Using appropriate SLs, it appears that the EP increases with increasing surface electron concentration and decreasing film thickness in spiky manners, which are the characteristic features of such quantized hetero structures. Under magnetic quantization, the EP oscillates with inverse quantizing magnetic field due to Shuvnikov-de Haas effect. The EP increases with increasing photo energy in a step-like manner and the numerical values of EP with all the physical variables are totally band structure dependent for all the cases. The most striking features are that the presence of poles in the dispersion relation of the materials in the absence of band tails create the complex energy spectra in the corresponding HD constituent materials of such quantum confined superlattices and effective electron mass exists within the band gap which is impossible without the concept of band tails. The well-known result of EP for bulk semiconductors having parabolic energy bands can be obtained as a special case of our generalized formulation and thus confirming the compatibility test. The content of this paper finds four important applications and we have suggested the methods of experimental determinations of important transport quantities in the field of quantum effect devices of nanoscience and nanotechnology.

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“…The electron concentration in this case is given by 31 is the totally quantized energy which can be obtained by substituting in (15) …”

Section: The Ep From Iv-vi Quantum Dot Hd Superlattices With Graded Imentioning

confidence: 99%

Einstein’s Photoemission from Quantum Confined Superlattices

Debbarma¹,

Kp²

2016

j nanosci nanotechnol

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“…It is the effective momentum mass which enters in various transport coefficients and plays the most dominant role in explaining the experimental results under different scattering mechanisms [5][6][7][8]. In recent years, the EMM in such materials under different external conditions has been studied extensively [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Under degenerate conditions, only the electrons at the Fermi surface of n-type semiconductors participate in the conduction process and, hence, the effective momentum mass (EMM) of the electrons corresponding to the Fermi level would be of interest in electron transport under such conditions.…”

Section: Effective Electron Massmentioning

confidence: 99%

Applications and Brief Review of Experimental Results

Ghatak¹,

Bhattacharya²

2010

Thermoelectric Power in Nanostructured Materials

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In this book, we have discussed many aspects of TPSM based on the dispersion relations of the nanostructures of different technologically important materials having different band structures in the presence of 1D, 2D, and 3D confinements of the wave-vector space of the charge carriers, respectively. In this chapter, we discuss few applications in this context in Sect. 14.2 and we shall also present a very brief review of the experimental investigations in Sect. 14.3 which is a sea in itself. Section 14.4 contains the single experimental open research problem.

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“…It has, therefore, different values in different materials and varies with electron concentration, with the magnitude of the reciprocal quantizing magnetic field under magnetic quantization, with the quantizing electric field as in inversion layers, with the nanothickness as in quantum wells and quantum well wires and with superlattice period as in the quantum confined superlattices of small gap semiconductors with graded interfaces having various carrier energy spectra. The nature of these variations has been investigated by Ghatak et al [18][19][20][21][22][23][24][25][26][27][28][29][30] and a few others [31][32][33][34][35]. Some of the significant features which have emerged from these studies are:…”

Section: Introductionmentioning

confidence: 99%

A simple theoretical analysis of the effective electron mass in III–V, ternary and quaternary materials in the presence of light waves

et al. 2007

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We present a simple theoretical analysis of the effective electron mass (EEM) at the Fermi level for III-V, ternary and quaternary materials, on the basis of a newly formulated electron energy spectra in the presence of light waves whose unperturbed energy band structures are defined by the three-band model of Kane. The solution of the Boltzmann transport equation on the basis of this newly formulated electron dispersion law will introduce new physical ideas and experimental findings under different external conditions. It has been observed that the unperturbed isotropic energy spectrum in the presence of light changes into an anisotropic dispersion relation with the energy-dependent mass anisotropy. In the presence of light, the conduction band moves vertically upward and the band gap increases with the intensity and colours of light. It has been found, taking n-InAs, n-InSb, n-Hg 1−x Cd x Te and n-In 1−x Ga x As y P 1−y lattice matched to InP as examples, that the EEM increases with increasing electron concentration, intensity and wavelength in various manners. The strong dependence of the effective momentum mass (EMM) at the Fermi level on both the light intensity and wavelength reflects the direct signature of the light waves which is in contrast with the corresponding bulk specimens of the said materials in the absence of photo-excitation. The rate of change is totally band-structure-dependent and is influenced by the presence of the different energy band constants. The well known result for the EEM at the Fermi level for degenerate wide gap materials in the absence of light waves has been obtained as a special case of the present analysis under certain limiting conditions, and this compatibility is the indirect test of our generalized formalism.

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Photoemission from quantum-confined structure of nonlinear optical materials

Cited by 7 publications

References 0 publications

Einstein’s Photoemission from Quantum Confined Superlattices

Einstein’s Photoemission from Quantum Confined Superlattices

Applications and Brief Review of Experimental Results

A simple theoretical analysis of the effective electron mass in III–V, ternary and quaternary materials in the presence of light waves

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