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electronic transmission of three-terminal pyrene molecular bridge

Chinese Physics B 2009年第2期18卷 501-505页

作者：王利光张秀梅 Terence Kin Shun Wong Katsunori Tagami Masaru Tsukada School of Science Jiangnan University School of Electrical and electronic Engineering Nanyang Technological University Nano Technology Research Centre Waseda University

This paper investigates theoretically the electronic transmission spectra of the three terminal pyrene molecular bridge and the quantum current distribution on each bond by the tight-binding model based on nonequilibrium Green＇s function and the quantum current density approach, in which one π molecular orbital is taken into account per carbon atom when the energy levels and HOMO-LUMO gap are obtained. The transmission spectra show that the electronic transmission of the three terminal pyrene molecular bridge depends obviously on the incident electronic energy and the pyrene eigenenergy. The symmetrical and oscillation properties of the transmission spectra are illustrated. A novel plus-minus energy switching function is found. The quantum current distribution shows that the loop currents inside the pyrene are induced, and some bond currents are much larger than the input and the output currents. The reasons why the loop currents and the larger bond currents are induced are the phase difference of the atomic orbits and the degeneracy of the molecular orbits. The calculations illustrate that the quantum current distributions are in good agreement with Kirchhoff quantum current conservation law.

关键词： pyrene three terminals electronic transmission current distribution

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THz-field-induced electronic transmission step-structure for a quantum wire

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Chinese Physics B 2004年第9期13卷 1531-1536页

作者：肖贤波周光辉杨谋李源徐志峰 DepartmentofPhysics HunanNormalUniversityChangsha410081China NationalLaboratoryofSuperlatticesandMicrostructures InstituteofSemiconductorsChineseAcademyofSciencesBeijing100083China

We study theoretically the low-temperature electronic transport property of a straight quantum wire under the irradiation of a finite-range transversely polarized external terahertz (THz) electromagnetic (EM) field. Using the freeelectron model and the scattering matrix approach, we show an unusual behaviour of the electronic transmission of this system. A sharp step-structure appears in the electronic transmission probability as the EM field strength increases to a threshold value when a coherent EM field is applied. We demonstrate that this effect physically comes from the inelastic scattering of electrons with lateral photons through intersubband transitions.

关键词： quantum wires THz electromagnetic field electronic transmission scattering matrix

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