SKM 2023 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 21: Quantum Chaos and Coherent Dynamics

DY 21.5: Talk

Tuesday, March 28, 2023, 15:00–15:15, MOL 213

Quantum Coherent Spin-Bath Dynamics and The Impact of Interactions on Quantum Memory Effects — •Tobias Boorman and Bernd Braunecker — University of St Andrews, St Andrews, United Kingdom

Using a robust theoretical framework, we systematically extract the joint-coherent dynamics of an impurity spin coupled to a strongly correlated material as the central process of a magnetic resonance. This framework enables a complete dynamical picture, extending beyond the usual high-temperature approximation that underpins the contemporary understanding of spin-bath decoherence, and allowing one to probe even further to the sub-thermal time regime, where quantum memory effects are the dominant feature. As a theoretically and experimentally accessible model of a strongly correlated conductor, we take the Luttinger liquid as a prototype to study how interactions alter the response of the bath to the impurity. Taken under the lens of the framework, we find that the joint quantum-coherent dynamics manifests itself as a rapid and seemingly instantaneous initial slip prior to the spin decoherence, whilst interactions within the bath play a role in modulating the amplitude and rate of this feature. We fit this understanding into a wider picture of magnetic resonance in interacting systems at intermediate temperatures, improving upon the known interaction-induced modifications of high-temperature approximations.