Separation of neutral and charge modes in one-dimensional chiral edge channels

E. Bocquillon, V. Freulon, Berroir J-.m, P. Degiovanni, B. Plaçais, A. Cavanna, Y. Jin and G. Fève ()
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E. Bocquillon: Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS (UMR8551), Université Pierre et Marie Curie
V. Freulon: Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS (UMR8551), Université Pierre et Marie Curie
Berroir J-.m: Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS (UMR8551), Université Pierre et Marie Curie
P. Degiovanni: Université de Lyon, Fédération de Physique André Marie Ampère, CNRS—Laboratoire de Physique de l'Ecole Normale Supérieure de Lyon 46 Allée d'Italie
B. Plaçais: Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS (UMR8551), Université Pierre et Marie Curie
A. Cavanna: CNRS—Laboratoire de Photonique et de Nanostructures Route de Nozay
Y. Jin: CNRS—Laboratoire de Photonique et de Nanostructures Route de Nozay
G. Fève: Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS (UMR8551), Université Pierre et Marie Curie

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Coulomb interactions have a major role in one-dimensional electronic transport. They modify the nature of the elementary excitations from Landau quasiparticles in higher dimensions to collective excitations in one dimension. Here we report the direct observation of the collective neutral and charge modes of the two chiral co-propagating edge channels of opposite spins of the quantum Hall effect at filling factor 2. Generating a charge density wave at frequency f in the outer channel, we measure the current induced by inter-channel Coulomb interaction in the inner channel after a 3-μm propagation length. Varying the driving frequency from 0.7 to 11 GHz, we observe damped oscillations in the induced current that result from the phase shift between the fast charge and slow neutral eigenmodes. We measure the dispersion relation and dissipation of the neutral mode from which we deduce quantitative information on the interaction range and parameters.

Date: 2013
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DOI: 10.1038/ncomms2788

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