Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Nonequilibrium Quantum Many-Body Systems (joint session TT/DY)
TT 33.3: Vortrag
Donnerstag, 8. September 2022, 15:30–15:45, H22
Nonequilibrium dynamics in pumped Mott insulators — •Satoshi Ejima1, Florian Lange2, and Holger Fehske1,2 — 1Institut für Physik, Universität Greifswald, Greifswald, Germany — 2Erlangen National High Performance Computing Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
The study of systems under optical excitation receives tremendous attention because of both the recent rapid developments of ultrafast pump lasers and the discovery of striking phenomena not observable in equilibrium. Various numerical techniques have been applied to optically excited systems to study nonequilibrium dynamics, e.g., the time-dependent version of exact-diagonalization technique or dynamical mean-field theory. Results for nonequilibrium dynamics based on tensor-network algorithms are still rare, however.
In this talk, we propose a direct numerical scheme in the matrix-product-states (MPS) representation for the computation of nonequilibrium dynamic response functions, which can be used for general (quasi-)one-dimensional systems. Using time-evolution techniques for (infinite) MPS, we calculate, directly in the thermodynamic limit, the time-dependent photoemission spectra and dynamic structure factors of the half-filled Hubbard chain after pulse irradiation. These quantities exhibit clear signatures of the photoinduced phase transition from insulator to metal that occurs because of the formation of so-called η pairs.
[1] S. Ejima et al., Phys. Rev. Res. 2, 032008(R) (2020)
[2] Phys. Rev. Res. 4, L012012 (2022)
[3] arXiv:2204.09085