Theory of ac quantum conduction through an ideal constriction |
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| Institution: | 1. Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany;2. Department of Physics, Faculty of Sciences, Ankara University, 06100 Tando?an, Ankara, Turkey;1. College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang 421002, China;2. Macao Polytechnic University, Macao 999078, China;3. College of Physics and Electrical Engineering, Kashi University, Kashi 844006, China;4. Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China;5. School of Materials Science and Engineering, Hunan University, Changsha 410082, China;1. Departamento de Investigación en Física, Universidad de Sonora, Apdo, Postal 5-88, 83190, Hermosillo, Sonora, Mexico;2. Universidad Estatal de Sonora, Rosales No. 189 Col. Centro C.P. 83100, Hermosillo, Mexico;3. CONACYT - Departamento de Investigación en Física, Universidad de Sonora, Apdo, Postal 5-88, 83190, Hermosillo, Sonora, Mexico |
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| Abstract: | A scattering theory is formulated for time-dependent (ac) transport through quantum constrictions or quantum point contacts. This is an extension of the standard scattering treatment for the time-independent (dc) case where quantized conductance steps and resonances occur. For an ideal constriction, the first-order transmission sidebands are derived when a time-dependent sinusoidal potential is applied. The frequency dependence of the conductance is discussed, and possible experiments are suggested. |
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