Scientific Achievement
Researchers in the Ultrafast Materials Science program observed that using ultrafast light pulses to modify the screening length of a charge density wave material, 1T-TiSe2 at a critical screening length, the system undergoes an instantaneous transition from a gapped CDW into a linearly dispersing semi-metallic state.
Significance and Impact
This work showcases how optical excitations enable the screening driven design of non-equilibrium semi-metallic phases, providing a pathway into highly screened phases in other strongly correlated materials.
Research Details
- A high intense laser pulse modulates the screening length driving instant change of the band structure
- Time resolved ARPES directly monitors the change in band structure, velocity and the semi-metallic state
- First principle DFT calculations in the weak and strong perturbation regime reproduce the observed effect of screening in modulating band structure
Publication Details
M. Huber, Y. Lin, G. Marini, L. Moreschini, C. Jozwiak, A. Bostwick, M. Calandra, A. Lanzara, Science Advances (2024).
Read the news article on this paper.
