Non-Equilibrium Dynamics of Photoexcited Correlated Quantum Matter

by Alexander Osterkorn
Doctoral thesis
Date of Examination:2023-02-07
Date of issue:2024-01-22
Advisor:Prof. Dr. Stefan Kehrein
Referee:Prof. Dr. Stefan Kehrein
Referee:PD Dr. Salvatore R. Manmana
Persistent Address: http://dx.doi.org/10.53846/goediss-10292

 

 

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Abstract

English

The interaction of time-dependent electromagnetic fields with electrons in quantum materials can give rise to many both fundamentally interesting as well as technologically relevant phenomena like transient band structure manipulations or the emergence of prethermal states of matter, which are not a result of heating. This thesis contributes theoretical insights to both these topics: We model the interference of Floquet and Volkov side bands, which are a result of the dressing of electron states by light, in a time-resolved angle-resolved photoemission spectroscopy (ARPES) experiment. Furthermore, we analyze the emergence of a band-like feature in the non-equilibrium spectral function of a one-dimensional charge-density wave insulator upon periodic driving. Secondly, we use the fermionic truncated Wigner approximation (fTWA), a phase space method for the time evolution of interacting fermions, to study the light-induced order parameter dynamics in SU(N)-symmetric fermionic lattice models. By comparison with exact analytical results for an interaction quench in the Hubbard model, we find that dephasing-induced prethermalization is correctly described by fTWA. We discuss photoinduced prethermal transitions between competing phases of matter in the large-N Hubbard-Heisenberg model and find a pronounced frequency-dependence of the transition. This work contributes to a better understanding of photoinduced order parameter dynamics from a microscopic perspective.
Keywords: quantum; nonequilibrium; condensed matter; physics; semiclassical; truncated Wigner approximation; prethermal; Floquet
 
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