VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Tuesday 6
Poster Session

› 21:00 - 23:00 (2h)
Thermal electric noise and decoherence rate formula in metals with non-trivial geometries
Christophe Texier  1, 2@  , Maximilian Treiber  3@  , Oleg Yevtushenko  3@  , Jan Von Delft  3@  , Igor Lerner  4@  
1 : Laboratoire de Physique Théorique et Modèles Statistiques  (LPTMS)  -  Website
Université Paris-Sud
LPTMS, Université Paris-Sud, 91405 Orsay -  France
2 : Laboratoire de Physique des Solides  (LPS)
Université Paris-Sud
LPS, Université Paris-Sud, 91405 Orsay -  France
3 : Ludwig Maximilians Universität  (LMU)
Ludwig Maximilians Universität, Munich, 80333 -  Germany
4 : School of Physics and Astronomy
School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT -  United Kingdom

The existence of electric potential fluctuations in metals is a key feature in order to understand their phase coherent properties at low temperature (below 1K, decoherence is dominated by electronic interactions in low dimensional metallic devices). A real space derivation of the (quantum generalization of the) Johnson-Nyquist theorem is used in order to construct a decoherence rate formula for the weak localisation (WL) correction to the conductivity. This accounts for classical and quantum noise, i.e. it properly cut off long time (decoherence) and short time (Pauli blocking) contributions to WL. The result is that decoherence by electronic interactions is not described by a unique rate, but through a functional of electronic trajectories. This makes the decoherence process itself geometry dependent. I will discuss recent experimental studies of phase coherence in mesoscopic metallic devices conveniently analys ed within this frame.

* References:

Maximilian Treiber, Christophe Texier, Oleg M. Yevtushenko, Jan von Delft & Igor V. Lerner,  Phys. Rev. B 84, 054204 (2011).

Thibaut Capron, Christophe Texier, Gilles Montambaux, Dominique Mailly, Andreas D. Wieck & Laurent Saminadayar, Phys. Rev. B 87, 041307(R) (2013).

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