Photoinduced correlated electron dynamics in a two-leg ladder Hubbard system
Abstract
Photoinduced carrier dynamics in a correlated electron system on a coupled two-leg ladder lattice are studied. The two-leg ladder Hubbard model is analyzed utilizing the exact diagonalization method based on the Lanczos algorithm in finite-size clusters. In order to reveal the transient carrier dynamics after photoirradiation, we calculate the low-energy components of the hole kinetic energy, the pair-field correlation function, the optical conductivity spectra, and other characteristics. It is shown that the photoinduced metallic-like state appears in a half-filled Mott insulating state, while the low-energy carrier motion is suppressed by photoirradiation in the case of hole-doped metallic states. These photoinduced changes in the electron dynamics are associated with changes in the carrier-pair coherence; they are not attributed to a naive thermalization, and are associated with a ladder-lattice effect instead. Based on the numerical results, optical control of hole pairs using double-pulse pumping is demonstrated. Implications for recent optical pump-probe experiments are presented.
- Publication:
-
Physical Review B
- Pub Date:
- April 2016
- DOI:
- 10.1103/PhysRevB.93.165133
- arXiv:
- arXiv:1511.00365
- Bibcode:
- 2016PhRvB..93p5133H
- Keywords:
-
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 9 pages, 10 figures