The Anthony J Leggett Institute for Condensed Matter Special Theory Seminar, Vojtech Vlcek (University of California, SB), "Theoretical Spectroscopy for Driven Systems"
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- Physics - The Anthony J Leggett Institute for Condensed Matter Theory
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- Physics - The Anthony J Leggett Institute for Condensed Matter Theory Seminar
Abstract: Understanding and predicting ultrafast, driven phenomena and the emergence of dynamical correlations in materials require theoretical frameworks that seamlessly integrate many-body theory, real-time dynamics, and open-quantum-system approaches on femtosecond timescales. Conventional many-body diagrammatic approaches are not scalable in practice and, as such, cannot describe the dynamics of realistic systems due to the complexity of time-evolution that incorporates time-nonlocal memory effects. I will present recent developments in overcoming these problems through the real-time Dyson expansion and dissipative Lindblad–Kadanoff–Baym approaches. The new formalisms circumvent the critical bottlenecks and provide a framework for computing spectroscopic observables in driven quantum systems. These approaches provide direct access to time-dependent spectral functions, enabling the analysis of dynamical signatures induced by external driving, relaxation, and dissipation. I will exemplify this by exploring the ultrafast renormalization of electronic states and the relaxation dynamics in model semiconductors. I will then focus on the description of emergent excitonic spectral signatures. I will specifically then comment on the limitations of the diagrammatic description of exciton-exciton interactions.
Zoom Link: https://illinois.zoom.us/my/icmt.seminar?pwd=ZU1KbnBLeXZLUmJKc0oyU205cDNDdz09
Meeting ID: 791 382 8328
Password: 106237