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  • 1
    Electronic Resource
    Electronic Resource
    Monte Carlo analysis of high-field hole diffusion coefficients in nondegenerate GaAs (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2438-2439 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We examine the field dependence of the carrier diffusion coefficients in GaAs using an ensemble Monte Carlo technique. An analysis for the field dependence of the hole diffusivity is presented for the first time. Unlike for the electrons, no significant interband transfer effects are observed. The hole diffusivity is seen to decrease monotonically with increasing field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101101
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Theoretical and experimental investigations of subpicosecond photoconductivity (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 236-246 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Monte Carlo methods are used to study photoconductive transients in gallium arsenide. It is demonstrated that working with presently established ranges for the Γ-L coupling coefficient, the existence of a velocity overshoot at moderate fields cannot be exactly predicted. The role of negative velocity electrons in the initial transient for short wavelength excitation is also demonstrated. Details of an actual experiment are described and evaluated against a model which incorporates the Monte Carlo simulation into a transmission line structure with a frequency-dependent characteristic impedance. The results demonstrate that an appropriately designed experiment can observe subpicosecond carrier transport transients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343918
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Anisotropy effects on the electronic transport in photoexcited GaAs (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 7388-7392 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the effects of both carrier and phonon k-space anisotropy on the transport in bulk GaAs photoconductors. Our results show that photogeneration by laser pulses polarized perpendicular to the electric field can delay the initial velocity rise. Furthermore, anisotropic phonon amplification can degrade the turn-off characteristics. Finally, unlike n-doped semiconductors, we find that the steady-state velocity-field values in photoconductors are reduced because of the nonequilibrium phonon modes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344526
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Hot-phonon and electron-hole scattering effects on the transient transport of photogenerated electrons in GaAs (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 4288-4294 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the transient response of photogenerated carriers to an external electric field in bulk GaAs. The results of our Monte Carlo simulations indicate that the initial velocity rise times are a strong function of the carrier density. This is caused by a combination of the hot-phonon effect and the enhanced electron-hole scattering within the plasma. Contrary to some previous suggestions, the hot-phonon effect alone is insufficient to explain the initial velocity behavior seen experimentally. The steady-state velocity is limited by the electron-hole scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343973
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  • 5
    Electronic Resource
    Electronic Resource
    Synchronous and asynchronous systems of threshold elements (1983)
    Springer
    Biological cybernetics 49 (1983), S. 1-7 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The role of synchronism in systems of threshold elements (such as neural networks) is examined. Some important differences between synchronous and asynchronous systems are outlined. In particular, important restrictions on limit cycles are found in asynchronous systems along with multi-frequency oscillations which do not appear in synchronous systems. The possible role of deterministic chaos in these systems is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336923
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    Paper (German National Licenses)
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