Photo-Induced Dynamics in Charge-Frustrated Systems

Abstract

Photo-excited charge dynamics of interacting charge-frustrated systems are studied using a spinless fermion model on an anisotropic triangular lattice. Real-time evolution of the system after irradiating a pump-photon pulse is analyzed by the exact diagonalization method. We focus on photo-excited states in the two canonical charge-ordered (CO) ground states, i.e., horizontal stripe-type and vertical stripe-type COs, which compete with each other owing to the charge frustration. We find that the photo-induced excited states from the two types of COs are distinct. From the horizontal stripe-type CO, a transition to another CO state called the three-fold CO phase occurs. In sharp contrast, the vertical stripe-type CO phase is only weakened by photo-irradiation. Our observations are attributable to the charge frustration effects occurring in the photo-excited states.

arXiv comment4 pages, 5 figures

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• Photoinduced Enhancement of Anisotropic Charge Correlations on Triangular Lattices with Trimers
• Photoinduced collective mode, inhomogeneity, and melting in a charge order system
• Photoexcitation of a polarization-inverted domain from the charge-ordered ferroelectric ground state of (TMTTF)${}_2$PF${}_6$
• Photoinduced dynamics of excitonic order and Rabi oscillation in the two-orbital Hubbard model
• Photoinduced melting dynamics and collective mode in a correlated charge-ordered system