Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 75: Quantum Computation: Simulation II
FM 75.4: Talk
Thursday, September 26, 2019, 14:45–15:00, 1010
Spectral properties of optically driven one-dimensional extended Hubbard model: An exact diagonalization study — •Junichi Okamoto1 and Shunsuke A. Sato2,3 — 1Institute of Physics, University of Freiburg, Freiburg, Germany — 2Center for Computational Sciences, University of Tsukuba, Tsukuba, Japan — 3Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
Quantum simulation is one of the key innovations in science, and has been elaborated in various platforms, e.g., cold atoms, quantum dots, and superconducting circuits. Recently, periodically driven quantum systems add another tuning knob to realize novel Hamiltonians via Floquet engineering. Notable examples are: control of band topology [PRL 118, 240403 (2017)], creation of artificial gauge fields [Nat. Phys. 9, 738 (2013)], and suppression of tunneling [PRL 100, 040404 (2008)]. Here we study dynamics induced by periodic driving in one-dimensional extended Hubbard model with an exact time-dependent Schrödinger equation solver. We characterize the driven system by transient conductivity and time-resolved spectral functions. We address various consequences due to different forms of driving, e.g., off-resonance, near resonance, continuous driving, or pulsed driving. For instance, when the system undergoes a transition from a Luttinger liquid to a gapped charge-density wave, an in-gap peak appears in the spectral function, while there is no Drude peak in conductivity, indicating localized carrier doping. On the other hand, when a charge-density wave is photodoped, we find no increase of in-gap density of states.