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Effet Kondo dans une géométrie triterminale

Abstract : In this manuscript, we are interested in a quantum dot
connected to three reservoirs. The Kondo cloud essentially develops in
the third reservoir which is strongly coupled to the quantum dot. The
other two reservoirs are weakly coupled to the quantum dot and are
used to probe the system by transport measurements.
After modeling such a three-terminal geometry, we have calculated the conductance matrix at zero temperature by Fermi liquids theory.
In the remaining of the manuscript, we focus on the case where the
third reservoir has a finite size, which confers to its density of
state a peaks structure.
We have first studied the system by the perturbative renormalisation group and have evaluated the Kondo temperature, which is the main energy scale of the problem.
Next, we have calculated the conductance matrix of the system at
different temperatures. For temperatures much stronger than the Kondo
temperature, we have used a perturbative approach. For temperatures
much weaker than the Kondo temperature, we have used a Fermi liquid
type theory. In the intermediate regime, we have used a numerical
method called slave bosons mean field theory. In the latter regime, we have also performed a spectroscopic analysis of the dot density of states.
Document type :
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Contributor : Julien Salomez <>
Submitted on : Wednesday, June 14, 2006 - 12:33:57 PM
Last modification on : Thursday, November 19, 2020 - 3:52:36 PM
Long-term archiving on: : Thursday, September 23, 2010 - 4:14:36 PM


  • HAL Id : tel-00079827, version 3




Julien Salomez. Effet Kondo dans une géométrie triterminale. Physique [physics]. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00079827v3⟩



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