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  • 1
    Electronic Resource
    Electronic Resource
    Proposed experiment to assess operation of quantum cellular automaton cells (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 6428-6433 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We propose an experiment for the detection of quantum cellular automaton (QCA) operation in a cell made up of four silicon quantum dots. We show that correlated switching between the two pairs of dots forming the cell can be clearly detected from the locking of the Coulomb blockade current peaks through each pair. We have performed numerical simulations on the basis of capacitance values obtained from experimental results on cells fabricated with silicon-on-insulator technology. This approach is shown to allow detection of QCA switching without the need for additional charge detectors, although fabrication parameters are rather critical. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1416856
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  • 2
    Electronic Resource
    Electronic Resource
    Performance assessment of adiabatic quantum cellular automata (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6435-6443 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the feasibility of an adiabatic logic scheme for cellular automaton systems recently proposed by Tóth and Lent [J. Appl. Phys. 85, 2977 (1999)], based on structured arrays of six-dot cells and on the use of a four-phase trapezoidal clock. With respect to the original quantum cellular automaton (QCA) concept, focused on ground state computation, a clocked scheme would have the advantage of being immune to the presence of metastable states and would allow pipelined operation, at the expense of additional complexity, due to the clock distribution circuitry. Based on realistic cell geometries and material systems, we have evaluated the obtainable switching times of QCA cells, and have determined the region in the parameter space that allows operation at a reasonable clock speed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1365078
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  • 3
    Electronic Resource
    Electronic Resource
    Simulation of a quantum-dot flash memory (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 5032-5036 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present the simulation of a flash memory in which the floating gate is replaced by a silicon quantum dot. Unlike conventional flash memories, this device promises the advantage of self-limited direct charging of the floating gate with a low writing voltage, thus allowing one to overcome hot carrier degradation problems. Due to the small dimensions of this memory device, quantum effects are expected to play an important role. To estimate their magnitude, we compare a semiclassical simulation based on the solution of Poisson's equation with a quantum computation solving the complete system of Schrödinger's and Poisson's equation. Despite the three-dimensional nature of the problem, a two-dimensional computational mesh proved to be sufficient to provide good agreement with experimental results, after three-dimensional corrections were included. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368750
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal behavior of quantum cellular automaton wires (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7320-7325 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the effect of finite temperature on the behavior of logic circuits based on the principle of quantum cellular automata (QCA) and of ground state computation. In particular, we focus on the error probability for a wire of QCA cells that propagates a logic state. A numerical model and an analytical, more approximate model are presented for evaluation of the partition function of such a system and, consequently, of the desired probabilities. We compare the results of the two models, assess the limits of validity of the analytical approach, and show that error probabilities depend on the ratio of the energy splitting between the ground state and first excited state to the thermal energy kT. We then provide estimates of the maximum operating temperature for a few relevant cases, and discuss possible approaches for increasing it. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372987
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  • 5
    Electronic Resource
    Electronic Resource
    Operation of quantum cellular automaton cells with more than two electrons (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3198-3200 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present evidence that operation of quantum cellular automaton (QCA) cells with four dots is possible with an occupancy of 4N+2 electrons per cell (N being an integer). We show that interaction between cells can be described in terms of a revised formula for cell polarization, which is based only on the difference between diagonal occupancies. We validate our conjectures with full quantum simulations of QCA cells for a number of electrons varying from 2 to 6, using the configuration–interaction method. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125276
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  • 6
    Electronic Resource
    Electronic Resource
    Three-dimensional simulation of nanocrystal Flash memories (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 2046-2048 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have developed a code for the detailed simulation of nanocrystal Flash memories, which consist of metal–oxide–semiconductor field-effect transistors (MOSFETs) with an array of semiconductor nanocrystals embedded in the gate dielectric. Information is encoded in the MOSFET threshold voltage, which depends on the amount of charge stored in the nanocrystal layer. Nanocrystals are charged through direct tunneling of electrons from the channel. Such memories are promising in terms of shorter write–erase times, larger cyclability, and lower power consumption with respect to conventional nonvolatile memories. We show results obtained from the self-consistent solution of the Poisson–Schrödinger equation on a three-dimensional grid, focusing on the charging process and on the effect of charge stored in the nanocrystals on the threshold voltage. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1361097
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  • 7
    Electronic Resource
    Electronic Resource
    Suppressed shot noise in trap-assisted tunneling of metal–oxide–semiconductor capacitors (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 2876-2878 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We show that the tunneling current of a metal–oxide–semiconductor capacitor subjected to voltage stress exhibits suppressed shot noise with respect to the "full" shot noise level associated with the same current before stress. We provide experimental results exhibiting a suppression down to about 70% and a theoretical model for transport and noise in the stress induced leakage current regime based on trap assisted tunneling, which is able to reproduce such reduction. Numerical results from the model are compared with measurements. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1321735
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  • 8
    Electronic Resource
    Electronic Resource
    Modeling and manufacturability assessment of bistable quantum-dot cells (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 2962-2971 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the behavior of bistable cells made up of four quantum dots and occupied by two electrons, in the presence of realistic confinement potentials produced by depletion gates on top of a GaAs/AlGaAs heterostructure. Such a cell represents the basic building block for logic architectures based on the concept of quantum cellular automata (QCA) and of ground state computation, which have been proposed as an alternative to traditional transistor-based logic circuits. We have focused on the robustness of the operation of such cells with respect to asymmetries derived from fabrication tolerances. We have developed a two-dimensional model for the calculation of the electron density in a driven cell in response to the polarization state of a driver cell. Our method is based on the one-shot configuration-interaction technique, adapted from molecular chemistry. From the results of our simulations, we conclude that an implementation of QCA logic based on simple "hole arrays" is not feasible, because of the extreme sensitivity to fabrication tolerances. As an alternative, we propose cells defined by multiple gates, where geometrical asymmetries can be compensated for by adjusting the bias voltages. Even though not immediately applicable to the implementation of logic gates and not suitable for large scale integration, the proposed cell layout should allow an experimental demonstration of a chain of QCA cells. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369061
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  • 9
    Electronic Resource
    Electronic Resource
    Rupture characterization of a low magnitude earthquake of central Apennines (Italy)
    Amsterdam : Elsevier
    Physics of the Earth and Planetary Interiors 82 (1994), S. 157-165 
    Details
    ISSN: 0031-9201
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0031-9201(94)90086-8
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  • 10
    Electronic Resource
    Electronic Resource
    A possibly new form of familial bone dysplasia resembling dyschondrosteosis (1983)
    Springer
    Pediatric radiology 13 (1983), S. 25-31 
    Details
    ISSN: 1432-1998
    Keywords: Dyschondrosteosis ; Mesomelic dwarfism ; Acromesomelic dwarfism ; Leri-Weill syndrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The authors report two patients, a 16-yearold girl and her 10-year-old brother, with striking bone changes of the acromesomelic dwarfism type, which do not fit any of the previously reported disorders of this group. The differential diagnosis from dyschondrosteosis and other related conditions is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00975662
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