Evolution of coherent collective modes through consecutive CDW transitions in (PO${}_2$)${}_4$(WO${}_3$)${}_{12}$ mono-phosphate tungsten bronze

Abstract

All optical femtosecond relaxation dynamics in a single crystal of mono-phosphate tungsten bronze (PO${}_2$)${}_4$(WO${}_3$)${}_{2m}$ with alternate stacking m=6 of WO${}_3$ layers was studied through the three consequent charge density wave (CDW) transitions. Several transient coherent collective modes associated to the different CDW transitions were observed and analyzed in the framework of the time dependent Ginzburg-Landau theory. Remarkably, the interference of the modes leads to an apparent rectification effect in the transient reflectivity response. A saturation of the coherent-mode amplitudes with increasing pump fluence well below the CDWs destruction threshold fluence indicates a decoupling of the electronic and lattice parts of the order parameter under strong optical drive.

References in corpus (8)

• Single particle and collective excitations in the one-dimensional charge density wave solid K0.3MoO3 probed in real time by femtosecond spectroscopy
• Coherent dynamics of macroscopic electronic order through a symmetry-breaking transition
• Non-thermal separation of electronic and structural orders in a persisting charge density wave
• Femtosecond "snapshots "of gap-forming charge-density-wave correlations in quasi-two-dimensional dichalcogenides 1T-TaS2 and 2H-TaSe2
• Dynamics of photoinduced Charge Density Wave-metal phase transition in K0.3MoO3
• Single-particle and collective mode couplings associated with 1- and 2-directional electronic ordering in metallic RTe${}_3$ (R = Ho, Dy, Tb)
• Disentanglement of the electronic and lattice parts of the order parameter in a 1D Charge Density Wave system probed by femtosecond spectroscopy
• Raman scattering evidence for a cascade-like evolution of the charge-density-wave collective amplitude mode

Cited by in corpus (4)

• Real-time observation of the coherent transition to a metastable emergent state in 1T-TaS${}_2$
• Time-resolved reflectivity and Raman studies of the interplay of enigmatic orders in Mo${}_8$O${}_{23}$
• Unconventional photo-induced charge-density-wave dynamics in 2H-NbSe${}_2$
• Orbitally-driven insulator-metal transition in CuIr${}_2$S${}_4$: Temperature dependent transient reflectivity study