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  • 1
    Electronic Resource
    Electronic Resource
    Theoretical study of tunneling current in the access region of various heterojunction field-effect transistor structures (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3603-3607 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The source resistance of a heterojunction field-effect transistor (HFET), whose reduction is mandatory for high-performance devices, consists of an ohmic contact resistance and an access resistance. The access region is located between the geometrical source and the geometrical source side of the gate contact. By means of a quantum-mechanical modeling program, the effect of changes in layer structure in the access region of a HFET is studied. A new heterojunction structure using a Si planar doped layer is designed to improve the linearity and reduce the access resistance by more than ten times for a specific transistor layout. Thanks to the higher sensitivity of the modeling program to structural information, the contribution of the tunneling current and the change of equilibrium as a function of temperature is investigated. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361414
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optical second-harmonic generation in laterally asymmetric quantum dots (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2726-2728 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate laterally asymmetric quantum dots (LAQDs) as second-order nonlinear optical elements in which symmetry-forbidden intersubband transitions become allowed due to lateral asymmetry. The susceptibility for second-harmonic generation (χ2ω(2)) of a two-dimensional LAQD with three equispaced energy levels was studied by calculating the product of the intersubband transition dipole moments. The product was as large as 0.95×10−3 Lx3 for a dot of length Lx confined by an infinite-potential barrier. The product was increased to 3.0×10−3 Lx3 by varying the aspect ratio (Ly/Lx) of the LAQD and decreasing the barrier height. The lateral asymmetry can be controlled by a gate electrode in semiconductor devices, leading to a device with tunable wavelength and nonlinear coefficients, suitable for quasi-phase matching in nonlinear optical waveguides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106857
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  • 3
    Electronic Resource
    Electronic Resource
    Coherent-electron intrinsic multistability in a double-barrier tunneling diode (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2268-2270 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently, a new mechanism leading to electrical multistability in coherent-electron tunneling devices was proposed. The reflection of coherent electrons at a barrier leads to the formation of resonant states in a quantum well in front of the barrier, and the resulting strongly modulated local density of states allows for multiple stable solutions of the Poisson equation to exist at fixed bias. These solutions are characterized by different resonant states being pinned close to the conduction-band edge, with each solution having its own unique tunneling characteristics. Here we show how these multiple-branch I(V) characteristics can be engineered. This approach may open up new possibilities for high-speed functional devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110525
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  • 4
    Electronic Resource
    Electronic Resource
    Detection of HHV-8 sequences and antigens in a MALT lymphoma associated with Sjögren's syndrome (2003)
    Oxford, UK : Munksgaard International Publishers
    Journal of oral pathology & medicine 32 (2003), S. 0 
    Details
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We describe the case of a bilateral parotid mucosa-associated lymphoid tissue (MALT) lymphoma associated with 2 years history of Sjögren's syndrome (SS), which was linked to human herpes virus 8 (HHV-8) infection. Using polymerase chain reaction (PCR) assay HHV-8 sequences were detectable in the lymphoma tissue of both sides. Serologic testing of the patient revealed HHV-8 antibodies in enzyme-linked immunosorbent assay (ELISA) and immunofluorescence assay (IFA). Immunohistologic staining with two antibodies against open reading frame (ORF) 26 and v-cyclin homologues of HHV-8 revealed positive staining of the salivary acinic cells whereas the lymphoma cells were negative. The potential influence of HHV-8 infection for MALT lymphoma development in this case and possible parallels to gastric MALT lymphoma are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0714.2003.00092.x
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