Ultrafast Renormalization of the On-Site Coulomb Repulsion in a Cuprate Superconductor

Calibrating Out-of-Equilibrium Electron–Phonon Couplings in Photoexcited MoS2

“…The electronic screening, corresponding to the electron− electron Coulomb interactions, are reduced by photoexcitation due to introduce the e/h pairs in the electron gas, which is consistent with previous works. 50,51 This reduction can give rise to an enhancement of the effective potential between the electrons and positively charged ions: namely, the EPC. Here we calculate the dielectric constant consisting of the electronic and ionic contributions.…”

Glassy dynamics of the one-dimensional Mott insulator excited by a strong terahertz pulse

“…We note here that the redshift of the Mott gap for ∆n d = 0.07 as shown in Fig. 2(c) is due to the dynamical Coulomb screening [79,80].…”

Local interpretation of time-resolved X-ray absorption in Mott insulators: Insights from nonequilibrium dynamical mean-field theory

“…36 Finally, the presence of excitons in XAS leads to a high sensitivity to photo-induced changes in the screening, whose dynamics is essential to understand the photo-manipulation of bandgaps in correlated solids. 7,11 dt s(t)e iωt , (A16) which implies the Fourier limitation of the spectral resolution due to a finite probe duration. A finite core hole…”

“…Together with the charge conserving nature of the probe, this makes XAS an attractive technique for the study of Mott insulators and correlated materials. [1][2][3] XAS is particularly appealing for the investigation of photo-excited nonequilibrium states, [4][5][6] since new generation free-electron laser sources enable timeresolved XAS (trXAS) measurements with high energy resolution, 7 and provide information on the nonequilibrium electronic structure which is complementary to time-resolved photoemission. Since the X-ray absorption process represents the first step in resonant inelastic X-ray scattering (RIXS) experiments, a better understanding of trXAS is also relevant in the context of time-resolved RIXS, which can reveal the nonequilibrium physics of low-energy excitations.…”

“…This can give rise to level shifts [10][11][12] which should be directly reflected in the XAS signal. 7 In multi-orbital systems we furthermore expect an ultrafast change of local multiplet occu-pations. For example, in a degenerate two-orbital Mott insulator at half-filling, the dominant local multiplet in equilibrium is the high-spin state, but after a laser excitation the photo-doped carriers can assist the ultrafast creation of other multiplets (so called Hund's excitons, i.e., inter-and intra-orbital singlets) which can be relatively long lived.…”