Photoexcitation-Energy-Dependent Transition Pathways from a Dimer Mott Insulator to a Metal

Details Photoexcitation-Energy-Dependent Transition Pathways from a Dimer Mott Insulator to a Metal Photoexcitation-Energy-Dependent Transition Pathways from a Dimer Mott Insulator to a Metal

2011-06-14

arxiv.org/abs/1106.2648v1

J. Phys. Soc. Jpn. 80, 084710 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, accepted for publication in J. Phys. Soc. Jpn

Scientific paper

We theoretically study pump-photon-energy-dependent pathways of a photoinduced dimer-Mott-insulator-to-metal transition, on the basis of numerical solutions to the time-dependent Schr\"odinger equation for the exact many-body wave function of a two-dimensional three-quarter-filled extended Peierls-Hubbard model. When molecular degrees of freedom inside a dimer are utilized, photoexcitation can weaken the effective interaction or increase the density of photocarriers. In the organic dimer Mott insulator, $ \kappa $-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Br, the intradimer and the interdimer charge-transfer excitations have broad bands that overlap with each other. Even in this disadvantageous situation, the photoinduced conductivity change depends largely on the pump photon energy, confirming the two pathways recently observed experimentally. The characteristic of each pathway is clarified by calculating the modulation of the effective interaction and the number of carriers involved in low-energy optical excitations. The pump-photon-energy-dependent pathways are confirmed to be realized from the finding that, although the effective interaction is always and slowly weakened, the introduction of carriers is sensitive to the pump-photon energy and proceeds much faster.

Affiliated with

Also associated with

No associations

Rating

Photoexcitation-Energy-Dependent Transition Pathways from a Dimer Mott Insulator to a Metal does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Photoexcitation-Energy-Dependent Transition Pathways from a Dimer Mott Insulator to a Metal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoexcitation-Energy-Dependent Transition Pathways from a Dimer Mott Insulator to a Metal will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-113376