VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Thursday 8
Quantum electronics, quantum information, electronic quantum optics, high frequency noise

› 15:00 - 15:20 (20min)
Effect of Coulomb interaction on two electron interferences in the nu=2 quantum Hall effect
Claire Wahl  1, *@  
1 : Centre de Physique Théorique  (CPT)  -  Website
Université Sud Toulon Var, Aix-Marseille Université - AMU, CNRS : UMR7332
CNRS Luminy case 907 13288 Marseille cedex 9 -  France
* : Corresponding author

Emitting a single electron at a time is of great importance in order to study electronic interferences as elementary processes. This has been achieved experimentally in the quantum Hall effect at filling factor nu=2 but recent results have shown that electronic interactions are not negligible in such a setup. Consequently, we consider a quantum Hall bar at this filling factor where interaction is turned on between the co-propagating channels on each edge. We inject single electrons on both incoming edges as exponential wave packets in real space which can backscatter at a quantum point contact, therefore mimicking the quantum optics Hong-Ou-Mandel interferometer. Because of interaction, the charge is fractionalized into two components propagating with different velocities. When computing the zero-frequency current correlations, we observe several dips whose depth and shape depend on the nature of the excitations interfering and on the interaction strength. Thus, those dips are a signature the decoherence processes taking place in the setup.

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