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

Abstract

We applied the time-resolved attosecond transient absorption spectroscopy to systematically investigate ultrafast optical responses of condensed matter systems. Under an intense pump pulse, absorption spectra indicate that the non-interacting electrons of band insulators produce a field-induced redshift, known as the dynamical Franz-Keldysh effect, as commonly expected. In contrast to the band insulators, in Mott insulators, unconventional spectra are observed which do not fully reflect the dynamical Franz-Keldysh effect. While it still exhibits the fishbone-like structures mimicking the dynamical Franz-Keldysh effect, the spectra show a negative difference absorption below the band edge, rendering a blueshift. In addition, the decomposed difference absorption reveals the creation and the annihilation of double occupancy mainly contribute to the negative signal, implying that the unconventional spectra are purely driven by the electron-correlations. These demonstrations of unconventional responses would guide us to the correlation-embedded attosecond electron dynamics in condensed matter systems.

arXiv comment7 pages, 8 figures

References in corpus (15)

• A Mott insulator of fermionic atoms in an optical lattice
• From the Kondo Regime to the Mixed-Valence Regime in a Single-Electron Transistor
• Dynamical Franz-Keldysh effect
• Direct and Simultaneous Observation of Ultrafast Electron and Hole Dynamics in Germanium
• Quantum interference between charge excitation paths in a solid state Mott insulator
• Photoinduced $\eta$ Pairing in the Hubbard Model
• Pressure dependent relaxation in the photo-excited Mott insulator ETF2TCNQ: Influence of hopping and correlations on quasiparticle recombination rates
• Unravelling the intertwined atomic and bulk nature of localised excitons by attosecond spectroscopy
• Femtosecond time-resolved dynamical Franz-Keldysh effect
• High-order harmonic generation in graphene: nonlinear coupling of intra and interband transitions
• Mixed regime of light-matter interaction revealed by phase sensitive measurements of the dynamical Franz-Keldysh effect
• Ultrafast Transient Absorption Spectroscopy of the Charge-Transfer Insulator NiO: Beyond the Dynamical Franz-Keldysh Effect
• Ab initio simulation of attosecond transient absorption spectroscopy in two-dimensional materials
• Fishbone resonance structure in the attosecond transient absorption spectroscopy of graphene
• Attosecond Transient Absorption Spectroscopy without Inversion Symmetry