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  • 1
    Electronic Resource
    Electronic Resource
    On a simplified analysis of the photoemission from quaternary alloys (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3032-3034 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An attempt is made to study the photo-emission from bulk specimens of quaternary alloys on the basis of three-band Kane model. It is found, taking In1−xGaxAsyP1−y lattice matched to InP as an example, that the photo-emission increases, with increasing carrier degeneracy and decreasing alloy composition respectively. The valence band splitting parameter influences significantly the numerical magnitude of the photo-emission in both cases. The corresponding well-known results of parabolic semiconductors having nondegenerate electron concentration 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/10.1063/1.346393
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  • 2
    Electronic Resource
    Electronic Resource
    On the thermoelectric power in n-channel inversion layers of ternary chalcopyrite semiconductors under magnetic quantization (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 299-304 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An attempt is made to investigate the thermoelectric power of the electrons under strong magnetic quantization in n-channel inversion layers of ternary chalcopyrite semiconductors at low temperatures, taking n-channel inversion layers on CdGeAs2 as examples, under both the weak and strong electric field limits, respectively. We have formulated the magneto-thermo power on the basis of newly derived two-dimensional electron energy spectra for both the limits by considering various types of anisotropies of the band parameters within the frame work of k(large-closed-square)p formalism. It has been observed that, the magneto-thermo power decreases with increasing surface electric field and decreasing quantizing magnetic field in an oscillatory manner for both the limits. The crystal field parameter enhances the numerical magnitudes and the corresponding results for n-channel inversion layers of parabolic semiconductors have also been obtained as special cases from the generalized expressions under certain limiting conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350299
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  • 3
    Electronic Resource
    Electronic Resource
    On the diffusivity-mobility ratio in small-gap semiconductors in the presence of a strong magnetic field: Theory and suggestion for experimental determination (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4309-4316 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An attempt is made to study the Einstein relation for the diffusivity-mobility ratio of the electrons in degenerate n-type small-gap semiconductors under strong magnetic field on the basis of three-band Kane model without any approximations of band parameters and incorporating the electron spin and broadening of Landau levels, respectively. It is found, taking n-Hg1−xCdxTe as an example, that the Einstein relation exhibits an oscillatory magnetic field dependence due to Shubnikov–de Haas effect and decreases with increasing alloy composition. Besides the same ratio increases with increasing electron concentration and is in close agreement with the suggested experimental method of determining the Einstein relation in degenerate semiconductors having arbitrary dispersion laws. In addition, the corresponding well-known results of parabolic semiconductors both in the presence and absence of magnetic field have been obtained from the generalized expressions under certain limiting conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349109
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  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of fluid helium at high pressures determined from speeds of sound (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 6163-6166 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The equation of state and heat capacity of fluid helium have been determined at temperatures from 98.15 to 298.15 K and at pressures from 100 to 1000 MPa using a new computational method. This is based on stepwise construction of ρT isobars starting from an experimental reference pρ isotherm and using the previously reported sound speed data of helium as a function of pressure and temperature. In the region of overlap, the calculated equation-of-state data show significant discrepancies from those obtained previously with direct measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462659
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of the equation of state and heat capacity of argon at high pressures from speed-of-sound data (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2130-2135 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A method is developed for the simultaneous determination of the equation of state and heat capacity of a gas over a wide range of pressure and temperature. This is based on stepwise construction of pT isochores starting from one experimental reference pV isotherm and using speed-of-sound data of the gas as a function of pressure and temperature. The application of the method is illustrated by computing the density and heat capacity of argon at temperatures from 148.15 to 298.15 K and at pressures from 100 to 1000 MPa. In the region of overlap, the calculated densities are found to be in good agreement with those obtained previously from direct measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459936
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  • 6
    Electronic Resource
    Electronic Resource
    Stochastic quantization of para-Fermi fields (1990)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 31 (1990), S. 156-163 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The application of the method of stochastic quantization originally attributed to Parisi and Wu has been extended to spinor fields obeying para-Fermi statistics. The connection between Euclidean and stochastic field theories is established in the conventional manner by proving the equivalence between a Langevin equation satisfied by para-Grassmann fields and a Fokker–Planck equation, the Hamiltonian of which has been constructed using para-Grassmann variables analogous to its construction from Grassmann variables in the Fermi case. As an example, a two-point Green function is calculated for any arbitrary value of order p of para-Fermi statistics, barring the pathological case p=2 which has been mentioned briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528854
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  • 7
    Electronic Resource
    Electronic Resource
    Supersymmetry, parastatistics, and operator realizations of a Lie algebra (1988)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 29 (1988), S. 16-20 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The algebraic structure of parastatistics has been generalized and it is found to be consistent with supersymmetric quantum mechanics with supercharges constructed out of the generalized para-Bose and para-Fermi operators. It is further shown that the operator algebra of generalized parastatistics offers a realization of the (graded) orthosymplectic group similar to that of orthogonal and symplectic groups using conventional parastatistics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528170
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  • 8
    Electronic Resource
    Electronic Resource
    Apparatus for the measurement of compressibility isotherms of gases up to 10 kbar: Experimental data for argon at 298.15 K (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 470-476 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An apparatus for the measurement of compressibility isotherms of gases up to pressures of 10 kbar and at temperatures between 273 and 350 K is described. It is based on a gas expansion method in which the pressure distortion of the experimental volume is evaluated by calibration with the measuring gas at lower pressures. The apparatus can easily be adapted for isochoric measurements over a wide temperature range. Measurements on argon at 298.15 K show that the method is capable of giving a precision of 0.02%–0.06% for the density, 0.1% for the pressure, and 2 mK for the temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139863
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  • 9
    Electronic Resource
    Electronic Resource
    Modified stepwise expansion method for the measurement of compressibility isotherms of gases up to 10 kbar (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1153-1154 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The stepwise expansion method for the measurement of compressibility isotherms of gases, developed recently in this laboratory, has been modified in order to measure those gases for which only low-pressure fiducial density data are available. The modified method has been tested with CH4 as a measuring gas at 298.15 K and up to 9.9 kbar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141440
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  • 10
    Electronic Resource
    Electronic Resource
    Apparatus for sound velocity measurements in gases up to 10 kbar: Experimental data for argon (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1269-1273 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An apparatus for the measurement of sound velocity in gases up to pressures of 10 kbar and down to temperatures of 77 K is described. Important features of the experimental setup include a specially designed ultrasonic cell with double reflectors, based on the phase comparison pulse-echo technique, and a vacuum type of cryostat using a cold finger system for temperature control. Detailed measurements on argon down to the melting line show that the method is capable of giving a precision of 0.02% for the sound velocity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1137990
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