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Full Description
In this book the coherent quantum transport of electrons through two-dimensional mesoscopic structures is explored in dependence of the interplay between the confining geometry and the impact of applied magnetic fields, aiming at conductance controllability.
After a top-down, insightful presentation of the elements of mesoscopic devices and transport theory, a computational technique which treats multiterminal structures of arbitrary geometry and topology is developed. The method relies on the modular assembly of the electronic propagators of subsystems which are inter- or intra-connected providing large flexibility in system setups combined with high computational efficiency. Conductance control is first demonstrated for elongated quantum billiards and arrays thereof where a weak magnetic field tunes the current by phase modulation of interfering lead-coupled states geometrically separated from confined states. Soft-wall potentials are then employed for efficient and robust conductance switching by isolating energy persistent, collimated or magnetically deflected electron paths from Fano resonances. In a multiterminal configuration, the guiding and focusing property of curved boundary sections enables magnetically controlled directional transport with input electron waves flowing exclusively to selected outputs. Together with a comprehensive analysis of characteristic transport features and spatial distributions of scattering states, the results demonstrate the geometrically assisted design of magnetoconductance control elements in the linear response regime.
Contents
Introduction.- Electrons in mesoscopic low-dimensional systems.- Coherent electronic transport: Landauer-Büttiker formalism.- Stationary scattering in planar confining geometries.- Computational quantum transport in multiterminal and multiply connected structures.- Magnetoconductance switching by phase modulation in arrays of oval quantum billiards.- Current control in soft-wall electron billiards: energy-persistent scattering in the deep quantum regime.- Directional transport in multiterminal focusing quantum billiards.- Summary, conclusions, and perspectives.
