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Branched Electron Current from Quantum Point Contacts and Novel Device Concepts

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Simulations have been performed of electron current flow through quantum point contacts demon- strating that novel device concepts ought to be feasible for fabrication. Using a finite difference method, wave packets, characterized at a temperature of approximately 44 K and at different transverse quantum modes, are shown to propagate through a quantum point contact with branched paths. A quantum switching effect is then generated when the number of occupied transverse modes is changed bytuning the width of a quantum point contact. The transmission probabilities and angular probability distribution for electrons ejected from quantum point contacts of typical shapes are calculated, which allows us to investigate how the geometrical parameters affect the branched electron flow. Based on the findings, two types of quantum switch devices were designed, one containing a parabolic reflector. The properties of the two devices are compared, particularly regarding the switching efficiency. Such concepts may not only lead to low-temperature devices but mayalso help make higher-temperature quantum devices more feasible.
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Keywords: ELECTRON WAVE PACKET; NANODEVICE; QUANTUM POINT CONTACT; QUANTUM SWITCH; TRANSMISSION PROBABILITY

Document Type: Research Article

Publication date: 01 October 2004

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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