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  • 1
    Electronic Resource
    Electronic Resource
    Characteristics of transmission resonance in a quantum-dot superlattice (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 2704-2708 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate phase-coherent electron transport through height-varying potential barriers in a quantum-dot superlattice. Due to the aspect ratio variations of two alternating potential heights in the quantum channel, well-arranged resonant peaks in the first miniband of each plateau are divided into the paired peaks of two groups, which produce an extra gap inside each miniband. In addition, for a five barrier case, the second and third resonant peaks in the miniband are no longer distinguishable at a critical aspect ratio, and the amplitude of this degenerate peak becomes smaller than one and eventually approaches zero. The mean lifetimes of the resonant peaks whose amplitudes remain unity are studied. We also examine the resonant tunneling with under-unity transmission in the one-dimensional superlattice system with alternating potential barriers. Finally, it is found that the "quasi-resonance" appears in a quantum-dot superlattice with 13 barriers consisting of 2 alternating potential heights. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287609
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  • 2
    Electronic Resource
    Electronic Resource
    Quantum interference in multichannel systems (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2863-2865 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Quantum interference effects in four parallel channels are theoretically investigated. We attribute interference effects to the different electron paths, by calculating the difference between the conductance (electronic probability distribution) for the four channels and the sum of the conductances (probability distributions) obtained with only one channel open at a time. The large variations of the conductance difference and a periodic behavior of the difference of probability distribution indicate wave-function phase shifts and interference due to alternative electron paths through the parallel channels. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360091
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  • 3
    Electronic Resource
    Electronic Resource
    Quantum transport anomalies in semiconductor nanosystems (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 7120-7129 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present quantum transport anomalies in the theoretical conductance of various semiconductor nanostructures. We first investigate a quantum channel with a chain of quantum boxes connected by slits, called a superlattice structure, and study the miniband and minigap effects associated with resonances and anti-resonances in the conductance. We also report studies of electron transport in a quantum wire containing series or parallel slits and a detector slit. In these systems, strong conductance oscillations due to quantum interference effects are predicted as a detector slit is moved across the wire. In the case of a single and multi-series slits, we attribute these effects to multiple reflections of the phase-coherent electron along the quantum wire. The transmission coefficients and electronic phase shifts are examined, which provide insights into the origins of these conductance oscillations. In the case of multi-parallel slits, peaks with two- (four-) fold splitting in the conductance are exhibited due to the quantum branch interference between the two (four) alternative electron paths. We also study the conductance of a quantum structure containing an artificially produced impurity. It is shown that the conductance modulations are strong when the impurity is scanned across the channel. We explain these oscillatory features of the conductance by a simple optical interference model and a simple adiabatic model. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360771
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  • 4
    Electronic Resource
    Electronic Resource
    Conductance oscillations due to a controllable impurity in a quantum box (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4676-4681 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present calculations of conductance in a multiply connected nanostructure with a quantum box geometry. Well-defined conductance oscillations appear which are attributed to the quantum interference effect in the presence of a controllable impurity in the quantum box. As the strength of the impurity potential is modulated, conductance oscillations arise from the constructive and destructive interference for the two electronic paths around the centrally located impurity and a third tunneling path through the impurity. We discuss the dependence of these oscillations on the size of the impurity, in terms of circulating or bound states in the quantum box formed by multiple reflections of the phase-coherent electron. The conductance oscillations are predicted to be strong for realistic structural parameters and robust against increasing temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358447
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  • 5
    Electronic Resource
    Electronic Resource
    Nanoelectronics using conductance quantization (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 3914-3916 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using a simple adiabatic transport model, we show that basic electronic functions may theoretically be achieved by manipulating a single propagating mode in a system with quantized levels of conduction. For a quantum point contact with a centered and tunable depletion island formed in a two-dimensional electron gas, a sinusoidal island bias results in a pulsed source–drain conductance. For single, multiple parallel, and multiple independent configurations of this device, the functions of a digital clock, digital frequency doubler, and hexadecimal counter are described. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366626
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  • 6
    Electronic Resource
    Electronic Resource
    Quantum electronic interferometer without a potential barrier (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 5892-5894 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We propose a novel electronic quantum interferometer which exhibits strong quantum interference effects in the ballistic regime. This behavior is produced without introducing additional barriers along the electronic path. Rather, by modulating the channel width of one of the arms in a multiply connected quantum nanoconstriction, one can produce an effect similar to that of an applied retarding gate potential. Strong conductance oscillations are then produced by quantum interference between phase-lagged propagating subbands in the different channels. We present results for typical structures, and discuss the dependence of these effects on electron path length and temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354166
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  • 7
    Electronic Resource
    Electronic Resource
    Resonant tunneling in a quantum nanosystem with an attractive impurity (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 6217-6220 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present the study of the conductance of a quantum nanosystem containing a finite-size attractive impurity. A single finite-size attractive impurity introduces multiple quasi-bound states in the channel for a sufficiently strong attractive potential, and these states give rise to multiple resonant peaks before the first plateau in the conductance. These resonant peaks, arising from the resonant tunneling through the multiple quasi-bound levels, have a Lorentzian shape centered around the resonant energy and exhibit a dramatic variation in the linewidths with resonant energy. The strength of the attractive impurity in the constriction is shown to strongly affect the resonant energy and the mean lifetime of each tunneling peak. The temperature dependence of the resonant peaks of conductance is also discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364408
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  • 8
    Electronic Resource
    Electronic Resource
    Collapse of resonance in quasi-one-dimensional quantum channels (1999)
    Springer
    Journal of experimental and theoretical physics 89 (1999), S. 144-150 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the resonance structure of the conductance (transmissivity) of a quasi-one-dimensional channel that contains an attractive impurity of finite dimensions and derive an exact expression for the scattering matrix. We show that an impurity of finite dimensions may cause a set of Fano resonances to appear in the transmissivity. We also find that due to the coherent interaction the Fano resonances can collapse and discrete levels may appear in the continuum. Finally, we establish the wave function of the discrete levels and study the channel transmissivity in the critical regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558969
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  • 9
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    Enhancement of charge transport in DNA molecules induced by the next nearest-neighbor effects (2012)
    American Institute of Physics
    Details
    Publication Date: 2012-11-01
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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  • 10
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    Nanoelectronics using conductance quantization (1998)
    American Institute of Physics
    Details
    Publication Date: 1998-04-01
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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