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We applied the time-resolved attosecond transient absorption spectroscopy tosystematically investigate ultrafast optical responses of condensed mattersystems. Under an intense pump pulse, absorption spectra indicate that thenon-interacting electrons of band insulators produce a field-induced redshift,known as the dynamical Franz-Keldysh effect, as commonly expected. In contrastto the band insulators, in Mott insulators, unconventional spectra are observedwhich do not fully reflect the dynamical Franz-Keldysh effect. While it stillexhibits the fishbone-like structures mimicking the dynamical Franz-Keldysheffect, the spectra show a negative difference absorption below the band edge,rendering a blueshift. In addition, the decomposed difference absorptionreveals the creation and the annihilation of double occupancy mainly contributeto the negative signal, implying that the unconventional spectra are purelydriven by the electron-correlations. These demonstrations of unconventionalresponses would guide us to the correlation-embedded attosecond electrondynamics in condensed matter systems.

Attosecond Transient Absorption Spectroscopy of Strongly Correlated Mott Insulators: Signature of the Creation and Annihilation of Double Occupancy