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

› 14:20 - 14:40 (20min)
Electron interferometry in quantum Hall edge channels
Jérôme Rech  1@  , Thibaut Jonckheere  1@  , Claire Wahl  1@  , Thierry Martin  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

We consider the electronic analog of the quantum optics HanburyBrown-Twiss, and Hong-Ou-Mandel interferometers, in a realistic condensed matter device based on single electron emission in chiral edge states. Considering first the case of integer quantum Hall effect, we show that the measurement of the zero-frequency current correlations at the output of a quantum point contact gives precious information on the electron emitted by the source and its coherence. For electron collisions, these correlations show a dip whose precise shape is directly related to the shape of the electronic wavepacket. As a feature truly unique to Fermi statistics and condensed matter, we show that two-particle interferences between electron and hole in the Fermi sea can produce a positive peak in the current correlations, which we study for realistic experimental parameters. We then explore the natural extension of this work which amounts to taking into account electronic interaction. This can be achieved either in a multi-channel system (e.g. filling factor 2) or in the fractional quantum Hall regime. Through a combination of out-of-equilibrium methods and the bosonization technique, we study these effects and discuss the ensueing wide variety of results.

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