Scientific Achievement
- Researchers in the Ultrafast Materials Science program demonstrated that ultrafast light pulses induce an indirect excitonic state in 1T-TaS2, triggering an instantaneous excitonic condensate at a critical time and low temperature
Significance and Impact
- Provided first experimental evidence of transient excitonic condensate in Bi2Se3, advancing the search for novel quantum phases and technologies
Research Details
- Time resolved ARPES directly monitors the back bending in band structure near EF and Mexican hat feature on top of valence band, signatures of the gap opening at the el and hole chemical potential
- Theoretical calculations reproduce the observed results and effect of exciton screening in modulating band structure
Publication Details
R R. Mori, K. Takasan, P. Ai, S. Ciocys, K. Kawaguchi, T. Kondo, T. Morimoto, A. Lanzara, Proceedings of the National Academy of Sciences of the United States of America (2025).
