Help Privacy Policy Disclaimer
  Advanced SearchBrowse




Journal Article

Ultrafast Electronic Band Gap Control in an Excitonic Insulator


Takagi,  H.
Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available

Mor, S., Herzog, M., Golež, D., Werner, P., Eckstein, M., Katayama, N., et al. (2017). Ultrafast Electronic Band Gap Control in an Excitonic Insulator. Physical Review Letters, 119(8): 086401.

Cite as: https://hdl.handle.net/21.11116/0000-000E-CFF0-A
We report on the nonequilibrium dynamics of the electronic structure of the layered semiconductor Ta2NiSe5 investigated by time-and angle-resolved photoelectron spectroscopy. We show that below the critical excitation density of F-C = 0.2 mJ cm(-2), the band gap narrows transiently, while it is enhanced above FC. Hartree-Fock calculations reveal that this effect can be explained by the presence of the low-temperature excitonic insulator phase of Ta2NiSe5, whose order parameter is connected to the gap size. This work demonstrates the ability to manipulate the band gap of Ta2NiSe5 with light on the femtosecond time scale.