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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

» presentations   » 2008.11.04-06




Control of the conductance and noise of driven carbon-based Fabry-Perot devices: Manifestation of the quantum wagon-wheel effect

L. E. F. Foa Torres and G. Cuniberti

Max Bergmann Symposium 2008

2008.11.04-06; Max Bergmann Center, Dresden, Germany

Time-dependent fields are a valuable tool to control fundamental quantum phenomena in highly coherent low dimensional electron systems. Here we report on the suppression and revival of the Fabry-Perot conductance interference pattern through a carbon-based three terminal device. By using Green functions techniques in the Floquet replica space as our general framework, we show that control of the interference pattern can be achieved by tuning the ac field strength and frequency. For frequencies matching (multiples of) the level spacing of the system a manifestation of the ,wagon-wheel effect in the quantum domain\u2019 takes place as the conductance and current noise remain irresponsive to the external field. When this condition is not satisfied,tuning the intensity of the ac gating induces an alternation of suppression and partial revival of the interference pattern. This scenario is tested for the case of carbon nanotubes, where the scaling properties of noise with tube radius and length are also explored.



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