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  • 1995-1999  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Controllable bistabilities and bifurcations in a photoexcited GaAs/AlAs superlattice (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 3845-3847 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Self-sustained photocurrent oscillations and bifurcation processes have been experimentally investigated in an undoped, photoexcited GaAs/AlAs superlattice by varying the laser intensity. Within a certain range of laser intensities, a bistability of the photocurrent can be observed in the photocurrent versus voltage characteristics. The width of the bistability region can be controlled by varying the laser intensity. In the bistable regime, the photocurrent oscillations disappear via a subcritical Hopf bifurcation with increasing applied voltage. Outside this regime, the transition from oscillations to a static state is a supercritical Hopf bifurcation for lower laser intensities, while at higher laser intensities a homoclinic connection is observed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124199
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Scanning thermal microscopy of a vertical-cavity surface-emitting laser (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 1604-1606 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A scanning thermal microscope was used to measure the temperature distribution inside a vertical-cavity surface-emitting laser. The peak temperature occurred at the intersection of the optical axis and the active quantum wells, and increased with input power at a rate of 0.74 °C/mW. Comparison with model predictions showed that the n mirrors and the substrate produce higher heat generation rates, possibly due to Joule heating and/or the absorption of spontaneous emissions that are often neglected in models. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119991
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Observation of misfit dislocations at the InxGa1−xAs/GaAs interface by ballistic-electron-emission microscopy (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 940-942 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report ballistic-electron-emission microscopy (BEEM) imaging and spatially resolved spectroscopy of InxGa1−xAs/GaAs misfit dislocations 800 A(ring) below the surface. Majority-carrier scattering by a fraction of misfit dislocations was seen to locally reduce the BEEM current and to give logarithmic spatial dependence, which suggests charging of the dislocation cores. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116950
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Nanofabrication of sensors on cantilever probe tips for scanning multiprobe microscopy (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 325-327 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple method for nanofabricating sensors on cantilever probe tips, used in atomic force microscopy (AFM), is described. The method uses voltage pulses to evaporate and create a nanometer-scale hole at the very end of a metallized AFM cantilever probe tip. The hole in the metal film can be used as a mask for further device fabrication. We demonstrate this by fabricating a nanothermocouple junction on the probe tip. Thermal images of electrically heated patterned metal lines obtained by this probe suggest the spatial resolution to be about 10 nm. Fabrication of nanosensors on probe tips is likely to assist in the future development of scanning multiprobe microscopy. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116074
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  • 5
    Electronic Resource
    Electronic Resource
    Instability of vortical and acoustic modes in supersonic round jets (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 9 (1997), S. 1003-1013 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of "top-hat" and fully developed jet profiles is investigated by an inviscid linear stability theory for compressible flow. The study covers a wide range of the Mach number and the temperature ratio. Two types of instabilities are found: vortical and acoustic, each of which can be subdivided into non-radiating (subsonic) and radiating (supersonic) modes. The vortical mode is the continuation of the Kelvin-Helmholtz instability from incompressible flow. The acoustic mode is a compressible flow phenomenon, which becomes important at large Mach numbers. Temperature-ratio effects can be destabilizing or stabilizing, depending on the Mach number and mode of instability. A spectrum of unstable acoustic modes, including axisymmetric ones, are found to exist in the fully developed jet. For this jet, acoustic axisymmetric waves become more unstable than both vortical and acoustic helical waves at Mach numbers over about 3. Strong evidence of a resonance mechanism for acoustic modes is seen in the growth rate curves at high Mach numbers, where a spectrum of local peaks and valleys appears at regularly distributed frequencies. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869196
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  • 6
    Electronic Resource
    Electronic Resource
    Direct Numerical Simulation of Supersonic Jet Flow (1997)
    Springer
    Journal of engineering mathematics 32 (1997), S. 121-142 
    Details
    ISSN: 1573-2703
    Keywords: DNS ; jets ; supersonics ; finite differences ; shocks.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Technology
    Notes: Abstract A numerical method is given for direct numerical simulation of the nonlinear evolution of instability waves in supersonic round jets, with spatial discretisation based on high-order compact finite differences. The numerical properties of a class of symmetric and asymmetric schemes are analysed. Implementation for the Navier–Stokes equations in cylindrical polar coordinates is discussed with particular attention given to treatment of the origin to ensure stability and efficiency. Validation of the schemes is carried out by detailed comparison with linear stability theory. The computer code is applied to study the initial stages of nonlinear development of unstable modes in a Mach 3 jet. The modes of instability that are present include strongly unstable axisymmetric acoustic and helical vortical waves, as well as weakly unstable radiating acoustic and vortical modes. Three distinctive wave patterns are observed from the simulations including a cross-hatched internal shock structure. Nonlinear interactions between the vortical and acoustic modes are investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004244715140
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    Paper (German National Licenses)
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