Seminarium Fizyki Materii Skondensowanej
sala 1.02, ul. Pasteura 5
2026-11-06 (12:15) 
Tadeusz Domański (Institute of Physic, M. Curie-Skłodowska University)
Electron Correlations and Pairing in Superconducting Nanostructures
Quantum impurities embedded in bulk superconductors experience pairing correlations through the proximity effect, developing the in-gap bound states. These quasiparticles have recently attracted considerable interests as building blocks of superconducting qubits used in quantum processors. Furthermore, under appropriate conditions, small assemblies of impurities provide a route to the bottom-up engineering of topological superconductivity.
The proximity induced pairing, however, is in conflict with strong Coulomb repulsion and their competition can drive a quantum phase transition between qualitatively distinct ground states. We investigate the many-body correlations near this phase boundary, including the subgap Kondo effect, and identify their signatures observable in charge transport. We also explore dynamical phenomena, related to evolution of in-gap bound states upon crossing the phase boundary. Surprisingly, we find evidence for quantum inertial behavior in response to ultrashort (nanosecond-scale) pulses.
The proximity induced pairing, however, is in conflict with strong Coulomb repulsion and their competition can drive a quantum phase transition between qualitatively distinct ground states. We investigate the many-body correlations near this phase boundary, including the subgap Kondo effect, and identify their signatures observable in charge transport. We also explore dynamical phenomena, related to evolution of in-gap bound states upon crossing the phase boundary. Surprisingly, we find evidence for quantum inertial behavior in response to ultrashort (nanosecond-scale) pulses.