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  • 1
    Electronic Resource
    Electronic Resource
    Modulation of excitonic reflectance at GaAs/GaAs interfaces (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4011-4014 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied photoreflectance (PR) and reflectance spectra of undoped molecular-beam-epitaxy GaAs films on semi-insulating GaAs substrates at low temperature. In the PR spectra a sharp structure near the band-gap energy was observed which is sensitive to pump and probe light intensity. The origin of this structure was investigated by combining time-resolved and depth-resolved measurements. It is shown that the sharp PR structure arises from the superposition of a fast and a slow component of the modulated spectra. The slow PR signal originates from the epilayer–substrate interface. Both components are attributed to the modulation of exitonic transitions centered at slightly different energies. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359923
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  • 2
    Electronic Resource
    Electronic Resource
    Below gap photoreflectance of semi-insulating GaAs (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4340-4343 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Below-gap structures in photoreflectance spectra of semi-insulating GaAs were observed originating from electroabsorption of light reflected from the back surface. The peak amplitude of these structures was strongly temperature dependent within the range (78–290) K. The different lineshape at low temperature in comparison to that at room temperature suggested different physical mechanisms. This conclusion was proven experimentally using a two phase lock-in technique by which a fast (X) and slow (Y) component of the spectra could be separated. A fit procedure provides the pure back surface reflection effect for both components. The X mode dominating at low temperatures is attributed to electromodulation of the field-broadened excitonic absorption tail whereas the Y mode originates from the Franz–Keldysh electroabsorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357320
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Feldverstärkung an ZnSCdS-Mn-Phosphoren bei Röntgenanregung (1961)
    Springer
    The European physical journal 161 (1961), S. 330-338 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung An einem ZnSCdS-Mn-Phosphor wurde die Feldverstärkung ϱ=B/B0 in Abhängigkeit von Spannung, Frequenz, Emissionswellenlänge und Röntgenintensität untersucht. Der Spannungsverlauf zeigt einen deutlichen Wendepunkt und geht bei höheren Feldstärken in eine Sättigung über. Die größte Verstärkung (ϱ ≈ 6) liegt bei tiefen Frequenzen; sie sinkt mit wachsender Frequenz schnell ab. Das Maximum der verstärkten Emission entspricht dem der gelben Manganbande bei 580 nm. Eine Auslöschung wurde für keinen Wellenlängenbereich beobachtet. Der Leuchtstoff zeigt den vonDestriau gefundenen „Gedächtniseffekt“. Doch ist dieser auch bei alleiniger Feldeinwirkung vorhanden. Der Feldfaktor ϱ und der Vorsensibilisierungsfaktor r zeigen weitgehend ähnliche Abhängigkeiten. Bemerkenswert ist die starke Zunahme von r bei kleinen Röntgenintensitäten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338938
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  • 4
    Electronic Resource
    Electronic Resource
    Excitons in the preionization electric field of a Schottky barrier (1998)
    Springer
    Physics of the solid state 40 (1998), S. 810-811 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The low-temperature (T=80 K) exciton reflectance spectra of CdS crystals in the electric field of a Schottky barrier are investigated. An anomalous Stark shift of a hydrogenic exciton state is detected in the preionization limit. An analysis of the spectra within the theory of a nonlocal dielectric response in a spatially inhomogeneous medium reveals the character of the subbarrier electric field distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130405
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  • 5
    Electronic Resource
    Electronic Resource
    Anomalous Stark effect on excitonic states in a preionization electric field (1996)
    Springer
    JETP letters 64 (1996), S. 42-46 
    Details
    ISSN: 1090-6487
    Keywords: 71.70Zj 7135Cc 78.40Fy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The low-temperature (T=80 K) excitonic light reflection spectra of CdS crystals in the electric field of a Schottky barrier are investigated. An anomalous Stark shift of the hydrogen-like excitonic state in the preionization limit is recorded for the first time. The distribution of the subbarrier electric field is determined from an analysis of the spectra performed on the basis of the theory of nonlocal dielectric response in a spatially inhomogeneous medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567156
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Vorsensibilisierung von Manganaktivierten Zinkkadmiumsulfiden durch elektrische Felder und Infrarotstrahlung (1963)
    Springer
    Czechoslovak journal of physics 13 (1963), S. 111-115 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The powder phosphor ZnCdS-Mn was used to make a more detailed investigation into memory, which was first described by Destriau in 1958. The effect of a field and infra-red radiation is modified by prior sensitization of the luminophore; this is apparent during further X-ray radiation primarily as a much higher luminescence intensity which later slowly decreases. A comparison of the results of measuring the brightness and charge on an electroluminescence panel permits conclusions to be reached on the actual mechanism. When a field is applied it excites polarization, the field of which does not have a great influence on the effect studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01699277
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