Dear all

Please be informed about the following solid state physics talk:

Date:        12. Januar 2012, 13:30h

Location:    HIT E 41.1

Speaker:    Matthieu Delbecq, Laboratoire Pierre Aigrain, Ecole Normale Supérieure, Paris, France

Title:        Coupling a quantum dot, fermionic leads and a microwave cavity on-chip

Abstract:

The recent development of circuit quantum electrodynamics has brought the possibility to study the interactions between light and matter with superconducting circuits. This ‘‘circuit
quantum electrodynamics’’ architecture allows one, at least in principle, to combine circuits with an arbitrary complexity.

We present a first step towards the use of quantum dots in a circuit QED context [1,2]. We demonstrate a hybrid architecture using single wall carbon nanotube based QD inserted in a superconducting microwave cavity [1].
At low temperature, this QD behaves as a tunable artificial atom where various transport regimes are observable, and especially the Kondo effect. Simultaneously to the low frequency transport spectroscopy,
we study the response of the microwave cavity when the dot is in the Coulomb blockade and Kondo regimes. This allows us to probe dynamical aspects of the Kondo effect which are inaccessible to conventional transport measurements
and to directly measure the capacitance of the QD (see also [2,3]).
Finally, we will discuss a microscopic model linking the measured electron-photon coupling to the spin, orbital and charge suceptibilities of the system and present preliminary experiments in the out-of-equilibrium regime of the quantum dot.

Host:        Andreas Wallraff

You are cordially invited!

Kind regards

-- 
Gaby Strahm
ETH Zürich
Solid State Physics Laboratory
Schafmattstr. 16, HPF F7
8093 Zürich
Switzerland

Phone: +41 44 633 23 35
Fax: +41 44 633 10 72

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