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  • 1
    Electronic Resource
    Electronic Resource
    Optimization of two dimensional gratings for very long wavelength quantum well infrared photodetectors (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4989-4994 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have performed a detailed study of two-dimensional grating coupling for quantum well infrared photodetectors in the very long wavelength spectral region λ∼16–17 μm. Using calculations based on the modal expansion method we quantitatively explain the double peaked responsivity spectrum. By optimizing the grating parameters we achieve a normal incidence responsivity and detectivity which are three times larger than the 45° angle of incidence geometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357209
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  • 2
    Electronic Resource
    Electronic Resource
    Resonant tunneling time delay and quantum well sheet density (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 1227-1230 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time delays, dwell times, resonant state lifetimes, and electron sheet densities associated with tunneling through quantum well structures are analyzed from a scattering theory (S-matrix) viewpoint. Some of the results differ from intuitively motivated expressions which have appeared in the resonant tunneling literature. It is shown that the sheet density is given by a formula similar to the Tsu–Esaki formula [Appl. Phys. Lett. 22, 562 (1973)] for current density. Sheet density and dwell time are related to Hermitian matrices which are expressed in terms of the S-matrix and in terms of partial widths associated with resonant states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343468
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  • 3
    Electronic Resource
    Electronic Resource
    Derivation and correction of the Tsu–Esaki tunneling current formula (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 693-696 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The theoretical basis of the Tsu–Esaki tunneling current formula [Appl. Phys. Lett. 22, 562 (1973)] is examined in detail and corrections are found. The starting point is an independent particle picture with fully antisymmetrized N-electron wave functions. Unitarity is used to resolve an orthonormality issue raised in earlier work. A new set of mutually consistent equations is derived for bias voltage, tunneling current, and electron densities in the emitter and collector. Corrections include a previously noted kinematic factor and a modification of emitter and collector Fermi levels. The magnitude of the corrections is illustrated numerically for the case of a resonant tunneling current-voltage characteristic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343539
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Optical and transport properties of single quantum well infrared photodetectors (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 1826-1831 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have performed an extensive series of measurements on symmetrical barrier bound-to-continuum and asymmetrical barrier bound-to-bound quantum well infrared photodetectors consisting of only a single well. We find that the behavior of the optical (e.g., responsivity) and transport properties (e.g., gain) as a function of bias is strikingly different from that of the usual multi-quantum well detectors. The simplicity of the structure has allowed an accurate theoretical calculation of the potential drops across each barrier, the photoinduced carrier depletion in the quantum well and therefore a detailed understanding of the device physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354789
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  • 5
    Electronic Resource
    Electronic Resource
    Tunneling emitter undoped quantum-well infrared photodetector (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 346-350 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An extensive series of measurements and theoretical analysis are presented on an undoped single-quantum-well infrared photodetector. The well is filled by electron tunneling through the thin emitter barrier resulting in several novel characteristics compared with the usual directly well-doped detectors. These include a unity optical gain and a dramatic drop in the well carrier density (and responsivity) at high bias when the bound state in the well drops below the emitter conduction-band edge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354115
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  • 6
    Electronic Resource
    Electronic Resource
    New degrees of freedom in resonant tunneling heterostructure devices (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4344-4348 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Lateral degrees of freedom in resonant tunneling heterostructure devices are investigated in a model which omits the usual assumption that the electric field and current density are laterally uniform. Relaxation of spatially nonuniform configurations of field and current into the usual uniform configurations is examined. For certain device parameters and operating conditions, stable nonuniform configurations are found in addition to the conventional uniform configurations. An eigenvalue criterion for stability is established. The possibility of nonuniform configurations with spatially localized oscillation is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348379
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  • 7
    Electronic Resource
    Electronic Resource
    Long-wavelength infrared detection in a Kastalsky-type superlattice structure (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 503-505 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The first successful demonstration of long-wavelength infrared (LWIR) detection with a Kastalsky-type AlGaAs/GaAs superlattice structure is reported. The experimental response band of the detector is centered near 10 μm in very good agreement with the theoretical response band provided that electron-electron interactions are taken into account. The detector operates at significantly lower bias voltage than photoconductive multiple quantum well LWIR detectors. This could lead to important advantages in applications to photovoltaic detector arrays. The response at 83 K is about 50% of the response at 24 K. Optimization of the response, operating temperature, or bias voltage has not been carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103634
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  • 8
    Electronic Resource
    Electronic Resource
    Quantum effects and bit errors in mesoscopic logic and memory circuits (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 34-36 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Bistability in well known circuits employing devices with nonlinear current-voltage characteristics is shown to be a classical concept which can be modified by quantum mechanical effects. The classically stable states "0'' and "1'' are shown to correspond to a single stable quantum mechanical state and a metastable state. Bit error rates associated with metastable state lifetimes are estimated for circuits employing quantum well devices and found to be appreciable in the mesoscopic regime (feature sizes (approximately-less-than)0.2 μm).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103570
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  • 9
    Electronic Resource
    Electronic Resource
    Exchange interactions in quantum well subbands (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1931-1933 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that exchange interactions in the two-dimensional electron gas in quantum wells could cause observable effects on subband energies and intersubband transition energies. In the case of doped quantum wells, the intrasubband exchange interaction can produce an energy shift which is substantially larger than the direct Coulomb energy shift. Theoretical estimates of such shifts are compared with experimental measurements of the infrared photoconductivity of multiple quantum well AlGaAs/GaAs structures with wells doped at about 1018 cm−3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100327
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  • 10
    Electronic Resource
    Electronic Resource
    Electron-electron interactions and resonant tunneling in heterostructures (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1865-1867 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Hartree–Fock approach [Z. Physik 61, 126 (1930)] is used to analyze electron-electron interactions in heterostructures. The analysis includes estimates of the effect of electron-electron interactions on localized states in quantum wells and resonant tunneling. Resonant tunneling is treated in a self-consistent narrow resonance approximation. The Hartree–Fock approach yields an explicit exchange interaction subband energy shift which is completely omitted in Poisson equation treatments. Exchange effects are found to be of the same order of magnitude but opposite in sign to direct interactions at typical electron densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100379
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