A scattering matrix approach to quantum pumping: beyond the small-AC-driving-amplitude limit |
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| Authors: | Zhu Rui |
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| Affiliation: | 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 hω 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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| Keywords: | quantum pumping scattering matrix approach multi-energy-quantum-related processes |
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