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Theses

Quantification du courant alternatif : la boîte quantique comme source d' électrons uniques subnanoseconde

Abstract : This thesis is devoted to the study of subnanosecond charge dynamics in a model quantum
conductor : the quantum RC circuit. By applying a radiofrequency excitation to a gate located
on top of a submicronic quantum dot, one probes the dynamics of charge transfer from the
dot to its electronic reservoir. In the linear regime, it is described by a quantum capacitance
related to the density of states of the dot and a constant charge relaxation resistance equal
to half the resistance quantum h/2e^2 when a single mode is transmitted between the dot and
the reservoir. This thesis is especially devoted to the study of the non-linear regime obtained
by applying a square excitation of amplitude comparable to the addition energy of the dot
(energy required to add a single charge). I have observed in this regime a quantization of the
ac current in units of 2ef demonstrating the emission and absorption of a single charge at
each period of the excitation signal. The device acts then as a single electron source similar
to single photon sources in optics. The evolution of the tunneling escape time of the charge
as a function of experimental parameters (dot-reservoir coupling, dot potential...) has been
measured in a broad time range, from a hundred of picoseconds to ten nanoseconds. These
results are in excellent agreement with a simple theoretical description that I have developed
during my thesis. This opens the way to single particle electron optics experiments.
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Submitted on : Monday, December 11, 2006 - 12:12:03 PM
Last modification on : Thursday, October 29, 2020 - 3:01:19 PM
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  • HAL Id : tel-00119589, version 1

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Gwendal Fève. Quantification du courant alternatif : la boîte quantique comme source d' électrons uniques subnanoseconde. Matière Condensée [cond-mat]. Université Pierre et Marie Curie - Paris VI, 2006. Français. ⟨tel-00119589⟩

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