Photon-Assisted ac Transport through Quantum Dots
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概要
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The ac currents through coherently driven quantum dots have been studied using a transfer-matrix method. This method enables us to calculate quantitatively the ac current of a nonequilibrium quantum system with realistic potential profiles. We show that the expected magnitude of the ac current induced by a time-varying potential is as large as that of the dc current and the photo-induced ac current can be observed by actual experiments. Amplitudes of ac current oscillate spatially, which means that the ac current depends on both frequency $\omega$ and wavenumber $q$. This is due to the fact that the ac current is induced by the interference between different sideband states. It has also been clarified that the quenching effect of ac current appears in a different manner from that of dc transport. Furthermore, we discuss a way of taking the thermal average of the ac current at a finite temperature under a finite dc-bias voltage.
- Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
- 2001-03-30
著者
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Yakubo Kousuke
Department Of Applied Physics Graduate School Of Engineering Hokkaido University
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Ohe Jun-ichiro
Department Of Applied Physics Hokkaido University
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