Extreme nonlinear dynamics of driven superconductors

Founding Body: European Community – Marie Skłodowska-Curie
Total grant: € 183k
Principal Investigator: Hector Pablo Ojeda Collado
Other participants: José Lorenzana
Project duration: 2020-2022


Due to very long energy relaxation times and strong non-linearities superconductors are the workhorse of many solid state quantum technologies.
Previous studies have shown that a periodically excited superconductor can be taken to a new highly-nonlinear regime where quasiparticles perform synchronous collective Rabi oscillations. SUPERDYN will address all the challenges to observe these and similar highly nonlinear states in experiments. In particular, we will analyse thermalization process beyond a mean-field dynamics i.e. taking into account the effect of the environment, residual interactions and disorder.
Results obtained with non-equilibrium diagrammatic techniques (Keldysh) will be validated comparing with computations within non-equilibrium dynamical mean-field theory (DMFT). Both the transient nonlinearities and the steady-state nonlinearities will be studied. In the latter case we expect typical effects of nonlinear quantum optics as induced transparency. A microwave device will be designed to measure these effects. This will require developing beyond state-of-the-art software and techniques to treat quasiparticle excitations and low-energy plasma modes on an equal footing. We will also develop a new variational method to obtain optimum driving protocols to obtain a desired transient superconducting state.
The project will benefit from the synergies with various experimental groups. Secondments in a leading DMFT group and a leading experimental group developing quantum devices will complement the formation.
The Experienced Researcher will be taken to a leadership position in the field of nonequilibrium superconductivity and solid-state quantum technologies with excellent future career prospects.

Nonequilibrium dynamics from BCS to the bosonic limit
G Seibold, J Lorenzana
Physical Review B 102 (14), 144502

Discovery of the soft electronic modes of the trimeron order in magnetite
E Baldini, CA Belvin, M Rodriguez-Vega, IO Ozel, D Legut, A Kozłowski, …
Nature Physics 16 (5), 541-545

Nonlinear dynamics of driven superconductors with dissipation
HP Ojeda Collado, G Usaj, J Lorenzana, CA Balseiro
Physical Review B 101 (5), 054502

High-TC Superconducting Kinetic Inductance Detectors for Terahertz Imaging
GC Messina, V Brosco, A Cruciani, L Benfatto, S Cibella, G Pettinari, …
2019 44th International Conference on Infrared, Millimeter, and Terahertz …

Fate of dynamical phases of a BCS superconductor beyond the dissipationless regime
HP Ojeda Collado, G Usaj, J Lorenzana, CA Balseiro
Physical Review B 99 (17), 174509

Population inversion and dynamical phase transitions in a driven superconductor
HP Ojeda Collado, J Lorenzana, G Usaj, CA Balseiro
Physical Review B 98 (21), 214519