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  • 1
    Electronic Resource
    Electronic Resource
    Influence of magnetic quantization on the effective electron mass in Kane-type semiconductors (1991)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 13 (1991), S. 867-880 
    Details
    ISSN: 0392-6737
    Keywords: Nonlocalized single-particle electronic states ; Electron density of states determinations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We study the effective electron mass at the Fermi level in Kane-type semiconductors on the basis of fourth order in effective mass theory and taking into account the interactions of the conduction electrons, heavy holes, light holes and split-off holes, respectively. The results obtained are then compared to those derived on the basis of the well-known three-band Kane model. It is found, takingn-Hg1−x Cd x Te as an example, that the effective electron mass at the Fermi level in accordance with fourth-order model depends on the Fermi energy, magnetic quantum number and the electron spin respectively due to the influence of band nonparabolicity only. The dependence of effective mass on electron spin is due to spin-orbit splitting parameter of the valence band in three-band Kane model and the Fermi energy due to band nonparabolicity in two-band Kane model. The same mass exhibits an oscillatory magnetic-field dependence for all the band models as expected since the origin of oscillations in the effective mass in nonparabolic compounds is the same as that of the Shubnikov-de Hass oscillations. In addition, the corresponding results for parabolic energy bands have been obtained from the generalized expressions under certain limiting conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457174
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the effective electron mass in quantum well wires of ternary chalcopyrite semiconductors (1990)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 891-900 
    Details
    ISSN: 0392-6737
    Keywords: General theories and computational techniques (including many-body perturbation theory, density-functional theory, atomic sphere approximation methods, Fourier decomposition methods, etc.) ; Effective mass ; Electronic transport phenomena in thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary An attempt is made to study effective electron mass in quantum well wires of ternary chalcopyrite semiconductors by formulating a new 1D dispersion relation, within the framework of thek·p formalism considering the anisotropies in the band parameters. It is found, taking quantum well wires ofn-CdGeAs2 as an example, that the effective Fermi level mass depends on the subband index due to the combined influence of crystal-field splitting parameter and the anisotropic spinorbit splitting parameters, respectively. The masses increase with increasing carrier degeneracy and decreasing film thickness, respectively. In addition, the well-known results for the corresponding parabolic energy bands have been derived as special cases of the generalized formulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453036
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of quantization of band states on the effective electron mass in quaternary alloys (1992)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 14 (1992), S. 903-925 
    Details
    ISSN: 0392-6737
    Keywords: Nonlocalized single-particle electronic states ; Electron density of states determinations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary An attempt is made to study the effective electron mass in quaternary alloys, taking a In1−x Ga x As y P1−y lattice matched to InP, by using the three-band Kane model under different physical conditions,e.g. bulk specimens, magnetic quantization, cross-field configuration, quantum well, electric-field-aided quantum well, magnetic-field-aided quantum well, quantum well under cross fields, quantum well wires, electric-field-aided quantum well wires, magnetic-field-aided quantum well wires and quantum well wires under cross fields by formulating the respective expressions. We have plotted the effective Fermi level mass with various physical variables under different conditions. In the presence of a quantizing magnetic field the effective mass depends on the spin splitting of Landau levels due to the spin-orbit splitting parameter of the valence bands. Under cross-field configuration and the various quantum confined low-dimensional systems, the effective masses depend on the respective quantum numbers in addition to the Fermi energies even for parabolic models because of the inherent features of such systems. In addition, the corresponding results for relatively wide-gap materials have also been obtained from our generalized formulations under certain limiting conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451675
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  • 4
    Electronic Resource
    Electronic Resource
    Thermoelectric power in superlattices of nonparabolic semiconductors with graded interfaces under magnetic quantization (1993)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 15 (1993), S. 97-112 
    Details
    ISSN: 0392-6737
    Keywords: Electronic transport phenomena in thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We study the thermoelectric power of the electrons under magnetic quantization in III–V, II–VI, PbTe/PbSnTe and strained layer superlattices with graded interfaces and compare the same with the corresponding bulk specimens of the constituent materials by formulating the respective expressions incorporating the broadening. It is found, by taking GaAs/Ga1−x Al x As, CdS/CdTe, PbTe/PbSnTe and InAs/GaSb superlattices with graded interfaces as examples, that the thermoelectric power exhibits oscillatory dependence with the inverse quantizing magnetic field due to Shubnikov-de Hass effect and increases with decreasing electron concentration in an oscillatory manner in all the aforementioned cases. The thermopower in graded superlattices is greater than that of constituent bulk materials together with the fact that the oscillations in superlattices show up much more significantly as compared to the respective constituent materials. In addition, the well-known expressions for bulk specimens of wide-gap semiconductors have also been obtained as special cases from our generalized expressions under certain limiting conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455854
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  • 5
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    On the Einstein relation in stressed Kane type semiconductors in the presence of an arbitrarily oriented quantizing magnetic field (1990)
    Institute of Physics
    Details
    Publication Date: 1990-07-01
    Print ISSN: 0031-8949
    Electronic ISSN: 1402-4896
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 6
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    A simple analysis of the electronic contribution to the elastic constants in stressed Kane type semiconductors (1992)
    Institute of Physics
    Details
    Publication Date: 1992-08-01
    Print ISSN: 0031-8949
    Electronic ISSN: 1402-4896
    Topics: Physics
    Published by Institute of Physics
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  • 7
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    Ionization states of low-energy cosmic rays - Results from Spacelab 3 cosmic-ray experiment (1993)
    Institute of Physics
    Details
    Publication Date: 1993-07-01
    Print ISSN: 0004-637X
    Electronic ISSN: 1538-4357
    Topics: Physics
    Published by Institute of Physics
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  • 8
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    Ionization states of low-energy cosmic rays - Results from Spacelab 3 cosmic-ray experiment (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Indian cosmic ray experiment Anuradha, conducted onboard Spacelab 3 during April 29-May 6, 1985 was designed to obtain information on the ionization states of low-energy cosmic rays, using the geomagnetic field as a rigidity filter to place an upper limit on the ionization state of individual cosmic ray particles. This paper presents data confirming the presence of three distinct groups of energetic particles in the near-earth space: (1) low-energy (15-25 MeV/nucleon) anomalous cosmic rays that are either singly ionized or consistent with their being in singly ionized state, (2) fully ionized galactic cosmic ray ions, and (3) partially ionized iron and sub-iron group ions (which account for about 20 percent of all the iron and sub-iron group ions detected at the Spacelab 3 orbit within the magnetosphere in the energy interval 25-125 MeV/nucleon). It is argued that these partially ionized heavy ions are indeed a part of the low-energy galactic cosmic rays present in the interplanetary space.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 411; 1; p. 418-430.
    Format: text
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    NASA TECHNICAL REPORTS
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