VietNam 2013 

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

 QNplage

 Nanophysics: from fundamentals to applications

(the return)

 

Thursday 8
Quantum electronics, quantum information, electronic quantum optics, high frequency noise

› 16:10 - 16:30 (20min)
Coulomb Blockade of Shot Noise
Fabien Portier  1@  , Carles Altimiras  1@  , Patrice Roche  1@  , Philippe Joyez  1@  , Olivier Palavecchio  1@  , Daniel Esteve  1@  , Denis Vion  1@  
1 : SPEC/IRAMIS/DSM
CEA
CEA Saclay 91191 Gif sur Yvette -  France

When electrical components are combined, quantum mechanics can affect even the simplest rules of electrodynamics such as the addition of series impedances when one component involves quantum transport. In this situation, the transfer of electrons across the element is associated to the creation of excitations in any series impedance, resulting in inelastic electron tunneling and hence in the so-called zero-bias anomaly of the conductance. For low series impedances, the excitation of the series impedance by the shot noise of the quantum element is at the origin of this Dynamcial Coulomb blockade of the conductance, as demonstrated by experiments in break junctions and quantum point contact. One important question now arises: what is the general relation between the current shot noise and Dynamical Coulomb Blockade ? Is there a Coulomb blockade of shot noise?

To investigate this question, we have embedded a tunnel junction in a microwave resonator which implements a "single-mode" electromagnetic environment, with a charcarateristic impedance large enough to observe DCB corrections to the conductance of the junction and to its the shot noise, well described by a recent theory.


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