Abstract
We report an optical modulation of the effective on-site Coulomb energy on a dimer () for achieving the Mott insulator-to-metal transition in , as investigated by pump-probe spectroscopy. A reduction of is optically induced by molecule displacement in the dimer under intradimer excitation. The mechanism of this metallization differs greatly from the photodoping-type mechanism reported previously. In contrast, a faster transition via the photodoping mechanism is detected for interdimer excitation. A metallic-domain-wall oscillation originating from the modulation of was also observed near the critical end point of the Mott transition line.
- Received 26 June 2009
DOI:https://doi.org/10.1103/PhysRevLett.103.066403
©2009 American Physical Society