Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 61: Correlated Electrons: 1D Theory

TT 61.6: Talk

Wednesday, March 20, 2024, 17:45–18:00, H 3010

Stability of Floquet-Bloch states in 1D strongly correlated fermions subject to perturbations — •Karun Gadge and Salvatore R. Manmana — Institute for Theoretical Physics, Georg-August-University Goettingen

Recent experiments have shown many exciting applications of Floquet engineering, where the interaction of the light field with electrons in materials is used to tailor the band structure. However, for strongly correlated systems, many questions concerning the formation and stability of these Floquet-Bloch states (FBs) are still open. Here, we investigate for the influence of electron-electron interactions, a perturbing noise in the coherent driving, and the presence of electron-phonon interactions on the FBs visible in time-resolved single-particle spectral functions. In particular, using exact diagonalizations and matrix product states (MPS) we treat a chain of interacting spinless fermions in 1D, which for strong interactions forms a correlated charge density wave insulator. Even in the presence of strong electron-electron interactions, we find replicas of the full holon continuum in the spectral function, as well as an aditional in-gap mode related to the Villain mode of quantum antiferromagnets at low temperatures [1]. We discuss results for different intensity and frequency of the light field, as well as for the stability of the FBs in the presence of classical phonons and incoherent noise in the driving.

[1] A. Osterkorn, C. Meyer, S.R. Manmana, Commun. Phys. 6 (2023) 245

Keywords: Floquet states; Strongly correlated systems; non-equilibrium dynamics