Microscopic coupling of coherent oscillations and photoexcited carriers to the optical transition

Clarify the microscopic details of how coherent charge-density-wave oscillations and photoexcited carriers couple to the optical transition in TiSe₂.

Background

The study investigates wavelength-dependent transient reflectivity in the CDW state of TiSe₂, focusing on coherent oscillations of the CDW amplitude mode and other phonons, as well as the response of photoexcited carriers. Although the measurements reveal distinct spectral signatures, the microscopic mechanism connecting these dynamical degrees of freedom to the relevant optical transition remains unresolved. Resolving this coupling is necessary for a microscopic understanding and ultrafast control of CDW properties.

References

However, the microscopic details of how these coherent oscillations and photoexcited carriers couple to the optical transition remain unclear.

— Spectroscopic signatures of mode-selective electron-phonon coupling in transient reflectivity change on charge-density-wave TiSe$_2$  (2609.10348 - Mizukoshi et al., 9 Sep 2026) in Introduction, second paragraph