SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

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

DY 12.5: Vortrag

Dienstag, 28. März 2023, 10:30–10:45, HSZ 204

Photoinduced pairing states of excitonic insulators — •Satoshi Ejima — DLR Quantencomputing-Initiative, Hamburg, Germany

Applying the time-dependent density-matrix renormalization group technique, we explore photoinduced pairing states in the half-filled extended Falicov-Kimball model (EFKM) in one dimension, both with and without internal SU(2) symmetry. In the time-dependent photoemission spectra simulated with the optimal pump pulse parameters, an extra band appears above the Fermi energy after pulse irradiation, implying a photoinduced metallization. Even in the absence of the SU(2) structure, the electron-electron pair correlations can also be enhanced during the pump, while they decrease over time after pulse irradiation. This suggests a possible photoexcited metallization of Ta2NiSe5, a strong candidate for an excitonic insulator material, for which the EFKM is considered to be the minimal theoretical model. Computing the time-dependent photoemission spectra with the parameter set for this material, i.e., in the EFKM without SU(2) symmetry, we demonstrate the photoinduced insulator-to-metal transition, in accord with recent findings in time- and angle-resolved photoemission spectroscopy experiments on Ta2NiSe5.
[1] S. Ejima, F. Lange, H. Fehske, Phys. Rev. B 105, 245126 (2022)

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