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A scattering matrix approach to quantum pumping: beyond the small-AC-driving-amplitude limit |
Zhu Rui(朱瑞)$†ger$ |
Department of Physics, South China University of Technology, Guangzhou 510641, China |
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Abstract In the adiabatic and weak-modulation quantum pump, net electron flow is driven from one reservoir to another by absorbing or emitting an energy quantum $\hbar\omega$ from or to the reservoirs. This paper considers high-order dependence of the scattering matrix on the time. Non-sinusoidal behaviour of strong pumping is revealed. The relation between the pumped current and the ac driving amplitude varies from power of 2, 1 to 1/2 when stronger modulation is exerted. Open experimental observation can be interpreted by multi-energy-quantum-related processes.
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Received: 26 February 2010
Revised: 15 May 2010
Accepted manuscript online:
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PACS:
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72.10.Bg
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(General formulation of transport theory)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11004063), the Fundamental Research Funds for the Central Universities (Grant No. 2009ZM0299), the Natural Science Foundation of South China University of Technology (Grant No. x2lxE5090410), and the Graduate Course Construction Project of South China University of Technology (Grant No. yjzk2009001). |
Cite this article:
Zhu Rui(朱瑞)$†ger$ A scattering matrix approach to quantum pumping: beyond the small-AC-driving-amplitude limit 2010 Chin. Phys. B 19 127201
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