Numerical simulations of spectroscopic properties in two-dimensional Mott insulator

Takami Tohyama, Kazuya Shinjo, Shigetoshi Sota, Kenji Tsutsui

Research output: Contribution to journalConference articlepeer-review


We numerically investigate spectroscopic properties for a two-dimensional Mott insulator described by a half-filled Hubbard model on the square lattice. Firstly, we examine the spectral shape of the optical conductivity by using time-dependent density-matrix renormalization group implemented by the Legendre polynomial expansion. We find a shape peak resembling to an excitonic peak at absorption edge, whose origin is attributable to antiferromagnetic correlation in the spin background. We next investigate momentum-dependent transient charge and spin dynamics after photoirradiation by using time-dependent Lanczos-type exact diagonalization. We find a temporal oscillation in the intensity of the dynamical spin structure factor, which exhibits an antiphase behavior between, for example, two orthogonal momentum directions parallel and perpendicular to the electric field of a pump pulse. Observing such antiphase oscillations will be a big challenge for time-resolved resonant-inelastic x-ray scattering experiments.

Original languageEnglish
Article number012028
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 28 Mar 2022
Event32nd IUPAP Conference in Computational Physics, CCP 2021 - Coventry, Virtual, United Kingdom
Duration: 2 Aug 20215 Aug 2021


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