Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-07-26
Phys. Rev. Lett. 100, 146802 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
LaTeX, 5 pages, 4 eps figures
Scientific paper
10.1103/PhysRevLett.100.146802
We investigate weak localization in metallic networks etched in a two dimensional electron gas between $25\:$mK and $750\:$mK when electron-electron (e-e) interaction is the dominant phase breaking mechanism. We show that, at the highest temperatures, the contributions arising from trajectories that wind around the rings and trajectories that do not are governed by two different length scales. This is achieved by analyzing separately the envelope and the oscillating part of the magnetoconductance. For $T\gtrsim0.3\:$K we find $\Lphi^\mathrm{env}\propto{T}^{-1/3}$ for the envelope, and $\Lphi^\mathrm{osc}\propto{T}^{-1/2}$ for the oscillations, in agreement with the prediction for a single ring \cite{LudMir04,TexMon05}. This is the first experimental confirmation of the geometry dependence of decoherence due to e-e interaction.
Bouchiat Helene
Ferrier Meydi
Gueron Sophie
Montambaux Gilles
Rowe Alistair C. H.
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