Mitteilung - Preisträger für das Wintersemester 2025/26 - Dr. Rishabh Jha
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From Chaos to Equilibrium: Dynamics and Thermodynamics of Fermionic Quantum MatterThe dissertation studies how strongly interacting quantum systems evolve in time, exchange energy, and spread information, especially in regimes where conventional theories fail. A recurring focus is the Sachdev-Ye-Kitaev family of models, which offers a clean theoretical laboratory for linking ideas from exotic quantum matter to concepts used in black hole physics, and for understanding strange metallic behavior observed at very low temperatures that does not fit standard models of electrons in solids. In addition, the dissertation uses Krylov complexity, a way to track how quickly quantum information gets mixed up and scrambled as a system evolves, and to compare different routes by which systems approach equilibrium. Moreover, in a setup inspired by ideas from black hole information studies, the work observes Page curve like entanglement dynamics in an interacting quantum system coupled to an environment, which might offer useful lessons about information flow in extreme quantum systems. It also reveals that, hidden inside the entanglement dynamics, there is a sharp turning point that signals a qualitative change in how the system shares and redistributes information between its parts.