Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La${}_{2-x}$Ce${}_x$CuO${}_{4\pm \delta }$

Abstract

We used femtosecond optical pump-probe spectroscopy to study the photoinduced change in reflectivity of thin films of the electron-doped cuprate La${}_{2-x}$Ce${}_x$CuO${}_4$ (LCCO) with dopings of x$=$0.08 (underdoped) and x$=$0.11 (optimally doped). Above T${}_c$, we observe fluence-dependent relaxation rates which onset at a similar temperature that transport measurements first see signatures of antiferromagnetic correlations. Upon suppressing superconductivity with a magnetic field, it is found that the fluence and temperature dependence of relaxation rates is consistent with bimolecular recombination of electrons and holes across a gap (2${\Delta }_{AF}$) originating from antiferromagnetic correlations which comprise the pseudogap in electron-doped cuprates. This can be used to learn about coupling between electrons and high-energy ($\omega >2{\Delta }_{AF}$) excitations in these compounds and set limits on the timescales on which antiferromagnetic correlations are static.

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• Transport anomalies and quantum criticality in electron-doped cuprate superconductors
• Collapse of density wave and emergence of superconductivity in pressurized-La${}_4$Ni${}_3$O${}_{10}$ evidenced by ultrafast spectroscopy
• Controlling competing orders via non-equilibrium acoustic phonons: emergence of anisotropic electronic temperature
• Photo-induced new metastable state with modulated Josephson coupling strengths in Pr${}_{0.88}$LaCe${}_{0.12}$CuO${}_4$
• Bosonic excitations and electron pairing in an electron-doped cuprate superconductor
• Study of pseudogap and superconducting quasiparticle dynamics in $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{r}}_2\mathrm{CaC}{\mathrm{u}}_2{\mathrm{O}}_{8+\delta }$ by time-resolved optical reflectivity
• Ultrafast spin dynamics in the proximate quantum spin liquid α-RuCl3
• Photoinduced two-step insulator-metal transition in Ti4O7 by ultrafast time-resolved optical reflectivity
• Interplay of electron-phonon coupling, pseudogap, and superconductivity in CsCa${}_2$Fe${}_4$As${}_4$F${}_2$ studied using ultrafast optical spectroscopy