Role of topological phase excitations in two-dimensional and multicomponent superconductors

In this seminar, I will provide an overview of my research on the role of topological phase excitations in various superconducting (SC) systems. I will explore how the interaction of SC vortices with quenched disorder and other low-energy fluctuations is crucial for understanding their finite-temperature phase diagrams, including the emergence of vestigial phases resulting from the partial melting of the SC ground state. In the second part, I will shift focus to a related but distinct topic: the study of novel electron condensates beyond the Cooper-pairing paradigm. In multicomponent SC systems with multiple broken symmetries, the proliferation of specific kinds of topological excitations can stabilize condensates formed by electron quadruplets, a new state of matter whose properties have yet to be fully revealed. I will present the first experimental evidence for this exotic phase and discuss future research directions.

Zoom: https://dipc-org.zoom.us/j/99346300368
YouTube: https://youtube.com/live/qFHF3TMl4Hw