Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-02-10
Adv. Solid State Phys. 40, 267 (2000)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 5 figures, Invited talk, presented at the March meeting of the German Physical Society, Regensburg, March 2000
Scientific paper
In recent experiments the non-equilibrium distribution function $f(E,U)$ in diffusive Cu and Au quantum wires at a transport voltage $U$ shows scaling behavior, $f(E,U)=f(E/eU)$, indicating a non-Fermi liquid interaction with {\it non-vanishing} T=0 scattering rate. The two-channel Kondo (2CK) effect, possibly produced by degenerate two-level systems, is known to exhibit such behavior. Generalizing the auxiliary boson method to non-equilibrium, we calculate $f(E,U)$ in the presence of 2CK impurities. We show that the 2CK equations reproduce the scaling form $f(E/eU)$. For all measured samples the theoretical, scaled distribution functions coincide quantitatively with the experimental results, the impurity concentration being the only adjustable parameter. This provides a microscopic explanation for the experiments and, considering that no other mechanism producing the scaling form is known to date, lends strong evidence for the presence of degenerate two-level defects in these systems. The relevance of these results for the problem of dephasing in mesoscopic wires is discussed.
No associations
LandOfFree
Energy and phase relaxation in non-equilibrium diffusive nano-wires with two-level systems does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Energy and phase relaxation in non-equilibrium diffusive nano-wires with two-level systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energy and phase relaxation in non-equilibrium diffusive nano-wires with two-level systems will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-369833