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• W2023348666 abstract "Quantum-mechanical calculations of the conductance for model devices, consisting of double-quantum-point constrictions (QPCs) connected in series by a cavity, are carried out with use of the coupled-mode transfer method and wave-function matching technique. The effect of the geometry-induced scattering on the electron transport is in detail studied by varying the shape of the cavity and geometric scale of the devices. The characteristics of the conductance of the device are essentially determined by the quantum interference of the electron waves with different phases arising from multiple scattering and reflections of electrons in the cavity. When electrons are initially injected into the lowest transverse mode in the structure, as the energy of incident electrons increases the longitudinal quantum momentum of electrons becomes large and therefore electrons are substantially collimated along the propagating direction. However, when the energy of the electrons increases continuously the second conducting channel begins to open and the corresponding transverse quantum momentum of incident electrons is larger than that of the ground mode. This leads to the permitted divergent (deflection) angle for the electrons in the cavity against the propagating axis enlarges, thus, the reflection times of electrons by the cavity walls increase. The destructive interference of the multiple reflection waves leads to a conductance value less than the ideal quantization value, exhibiting ohmic-like-type transport with additivity of the series resistances. When the shape of the cavity takes more opening, the geometry-induced scattering is largely suppressed and the conductance in the series dual QPC structures is finally determined by that of the QPC with the lowest conductance." @default.
• W2023348666 created "2016-06-24" @default.
• W2023348666 creator A5025828494 @default.
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• W2023348666 date "1993-06-01" @default.
• W2023348666 modified "2023-10-18" @default.
• W2023348666 title "Effect of geometry‐induced scattering on the quantum conductance in double‐quantum‐point constrictions connected in series by a cavity" @default.
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• W2023348666 doi "https://doi.org/10.1063/1.353996" @default.
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