Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Nonequilibrium Quantum Many-Body Systems (joint session TT/DY)

TT 33.8: Talk

Thursday, September 8, 2022, 17:00–17:15, H22

In-Gap Band Formation in a Periodically Driven Charge Density Wave Insulator — •Alexander Osterkorn, Constantin Meyer, and Salvatore Manmana — University of Göttingen, Göttingen, Germany

Periodically driven quantum many-body systems host unconventional behavior not realized at equilibrium. Here we investigate such a setup for strongly interacting spinless fermions on a chain, which at zero temperature and strong interactions form a charge density wave insulator. Using unbiased numerical matrix product state methods for time-dependent spectral functions, we find that driving of the correlated charge-density wave insulator leads not only to a renormalization of the excitation spectrum as predicted by an effective Floquet Hamiltonian [1], but also to a cosine-like in-gap feature [2]. This is not obtained for a charge density wave model without interactions. A mean-field treatment provides a partial explanation in terms of doublon excitations. However, the full picture needs to take into account strong correlation effects. [1] Phys. Rev. Lett. 120, 127601 (2018) [2] arXiv:2205.09557