Aritra Lahiri, University of Würzburg

Leuchs-Russell Auditorium, A.1.500, Staudtstr. 2

Location Details

Abstract:
I will present recent results on non-equilibrium microscopic dynamics in Josephson junctions, going beyond usual steady-state or perturbative treatments. In tunnel junctions, we show that sharp voltage pulses can generate a fractional Josephson effect. For strong Josephson coupling, we show that the Higgs mode may be revealed either through an enhanced second-harmonic AC Josephson current, or a modified current–phase relation under microwave irradiation. I will also introduce a generalized Andreev reflection mechanism for DC-biased junctions.
In the second part, I discuss ongoing work using vision-transformer quantum states to study disordered Bose–Hubbard ladders with random flux. While random flux may render the non-interacting SSH model topological, its role in the interacting case remains an open question.