Cavity quantum electrodynamics with carbon nanotubes: from atomic-like systems to condensed matter
Monday, 13 Jun. 2016, 16:00 - 17:00
Presenter: Takis Kontos
Host: Karl Unterrainer
Where: TU Wien, HS 7 Schütte-Lihotzky, Karlsplatz 13
Cavity quantum electrodynamics techniques have turned out to be instrumental to probe or manipulate the electronic states of nanoscale circuits. Recently, cavity QED architectures have been extended to quantum dot circuits. These circuits are appealing since other degrees of freedom than the traditional ones (e.g. those of superconducting circuits) can be investigated. I will show how one can use carbon nanotube based quantum dots in that context. In particular, I will focus on the coherent coupling of a single spin  and the strong coupling of a hybrid superconductor quantum dot circuit to cavity photons.
Quantum dots also exhibit a wide variety of many body phenomena. The cQED architecture could also be instrumental for understanding them. One of the most paradigmatic phenomenon is the Kondo effect which is at the heart of many electron correlation effects. I will show that a cQED architecture has allowed us to observe the decoupling of spin and charge excitations in a Kondo system.
 J. J. Viennot, M.C. Dartiailh, A. Cottet and T. Kontos Science 349 408 (2015).