Dresden 2020 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 46: Many-body Quantum Dynamics I

DY 46.10: Talk

Thursday, March 19, 2020, 12:15–12:30, HÜL 186

Quenched Fermi systems mediating time delayed interactions — •Conor Jackson and Bernd Braunecker — University of St Andrews, St Andrews, UK

Impurity quenches in Fermi systems are known to substantially reorganise the Fermi sea, most dramatically illustrated by Anderson's orthogonality catastrophe. We investigate how the influence of the catastrophe is transmitted through the system, finding singular behaviour at the boundary of the light cone emanating from the quench. We examine how states localised some distance away from the impurity display the influence of the spreading shake up of the Fermi sea and explore using the long range effect of the quench to induce a time delayed interaction between such states. Such a coherent coupling via a largely incoherent medium may have uses in quantum information processing.