General topic.— Our research area lies at the border between condensed matter and quantum optics and deals with quantum many-body open systems.
Systems.— Our investigations are strongly related to ongoing experiments in hybrid light-matter systems. So far the focus has been mainly on neutral atoms coupled to nanophotonics structures like optical waveguides or cavities, allowing to enhance and control light-matter interactions. Ongoing research also involves exciton polaritons in semiconductors coupled to microcavities.
Approach.— We develop non-equilibrium field-theoretical approaches tailored for the study of many-body phenomena in the above open quantum systems. These approaches are novel in the context of quantum optics and non-trivially extend methods typically used in condensed matter.
Goals.— We are interested in fundamental theoretical problems in many-body physics like collective phenomena and non-equilibrium phases. However, since our techniques are quantitatively reliable, we also concretely investigate hybrid light-matter devices for quantum technologies, so far in the context ultraprecise metrology/sensing, with ongoing efforts in quantum nonlinear photon devices.
The strong long-range interactions intrinsic to these hybrid atom-photon systems can induce spontaneous ordering phenomena, with additional peculiarities arising from the driven-dissipative nature.
The strong long-range interactions combined with drive and dissipation can give rise to non-equilibrium steady-states, novel dynamical phase transitions, as well as peculiar quench dynamics.
The light field strongly coupled to the neutral atoms can work as an artificial dynamical gauge field for the matter, giving rise for instance to exotic topological states.