Monday, September 30^th 2013, 04:00 p.m.
Seminar Room 138B, Vienna University of Technology, "Freihaus"‐ building, 7^th floor, "red" – Wiedner Hauptstraße 8‐10, A‐1040 Vienna, AUSTRIA)

ABSTRACT: I will consider in this talk the regime of strong interaction between a two-level system and a bath of quantum oscillators, realizing the so-called "photonic Kondo state". The structure of the environment is found to involve quantum superpositions of adiabatic and anti-adiabatic modes, due to the competition between oscillator potential energy and spin tunneling. This mechanism leads to peculiar entanglement properties in the underlying many-body state, that offer an interesting look into the strong correlation problem. Based on this physical picture, a systematic variational Ansatz will be proposed and confirmed by Wigner tomography computed within the Numerical Renormalization Group.

Dr. Serge Florens
CNRS Grenoble, France