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DY: Fachverband Dynamik und Statistische Physik

DY 12: Nonequilibrium Quantum Many-Body Systems I (joint session TT/DY)

DY 12.4: Talk

Tuesday, March 28, 2023, 10:15–10:30, HSZ 204

Photoinduced spinful excitons in Hubbard systems with magnetic superstructures — Constantin Meyer and •Salvatore R. Manmana — Institute for Theoretical Physics, Göttingen University, Friedrich-Hund-Platz 1, 37077 Göttingen

The possibility to form excitons in photo-illuminated correlated materials is central from fundamental and application oriented perspectives. We show how the interplay of electron-electron interactions and a magnetic superstructure leads to the formation of a peculiar spinful exciton, which can be detected in the nonequilibrium spectral function and the time-dependent optical conductivity. We study these quantities by using matrix product states (MPS) following an electron-hole excitation in a class of one-dimensional Hubbard models with on-site interactions and alternating local magnetic fields, which realize correlated band insulators. An excitation in only one specific spin direction leads to an additional band in the gap region of the spectral function only in the opposite spin direction, and to an additional peak in the optical conductivity. We discuss implications for experimental studies in correlated insulator systems.