Optical absorption activated by an ultrashort half-cycle pulse in metallic and superconducting states of the Hubbard model
arXiv:2411.00313 · doi:10.1103/q1fw-tdk1
Abstract
The development of high-intensity ultrashort laser pulses unlocks the potential of pump-probe spectroscopy in sub-femtosecond timescale. Notably, subcycle pump pulses can generate electronic states unreachable by conventional multicycle pulses, leading to a phenomenon that we refer to as subcycle-pulse engineering. In this study, we employ the time-dependent density-matrix renormalization group method to unveil the transient absorption spectra of superconducting and metallic states in nearly half-filled one-dimensional and two-dimensional Hubbard models excited by an ultrashort half-cycle pulse, which can induce a current with inversion-symmetry breaking. In a superconducting state realized in attractive on-site interactions, we find the transient activation of absorptions at energies corresponding to the amplitude modes of superconducting and charge-density-wave states. On the other hand, in a metallic state realized in the two-dimensional model with repulsive on-site interactions, we obtain another type of absorption enhancements, which are distributed broadly in spin excitation energies. These findings indicate that superconducting and metallic states are sensitive to an ultrashort half-cycle pulse, leading to the transient activations of optical absorptions with their respective mechanisms.
7 pages, 5 figures
References in corpus (15)
- Amplitude / Higgs Modes in Condensed Matter Physics
- Attosecond Field Emission
- Higgs mode in a strongly interacting fermionic superfluid
- Amplitude Higgs mode and admittance in superconductors with a moving condensate
- Direct observation of non-local fermion pairing in an attractive Fermi-Hubbard gas
- Superconductivity in the attractive Hubbard model: functional renormalization group analysis
- Exact diagonalization study of optical conductivity in two-dimensional Hubbard model
- Current-enabled optical conductivity of superconductors
- Supercurrent induced resonant optical response
- Photoinduced absorptions inside the Mott gap in the two-dimensional extended Hubbard model
- Density-matrix renormalization group study of optical conductivity of the Mott insulator for two-dimensional clusters
- Glassy dynamics of the one-dimensional Mott insulator excited by a strong terahertz pulse
- Anomalous suppression of photo-induced in-gap weight in the optical conductivity of a two-leg Hubbard ladder
- Keldysh crossover in one-dimensional Mott insulators
- Controlling inversion and time-reversal symmetries by subcycle pulses in the one-dimensional extended Hubbard model