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
Be environment friendly, only print this email if absolutely necessary.
QSIT Seminar qsit-seminar@phys.ethz.ch
ETH Zurich Sandra Künzel NCCR QSIT (Finances) HPF E 17 8093 Zurich
www.nccr-qsit.ethz.ch