Nonequilibrium optical response of a one-dimensional Mott insulator
Journal Article
·
· Physical Review. B
- Universidad del Rosario, Bogota (Colombia); OSTI
- Northeastern Univ., Boston, MA (United States)
We define, compute, and analyze the nonequilibrium differential optical conductivity of the one-dimensional extended Hubbard model at half-filling after applying a pump pulse, using the time-dependent density matrix renormalization group method. The melting of the Mott insulator is accompanied by a suppression of the local magnetic moment and ensuing photogeneration of doublon-holon pairs. The differential optical conductivity reveals (i) mid-gap states related to parity-forbidden optical states and (ii) strong renormalization and hybridization of the excitonic resonance and the absorption band, yielding a Fano resonance. We offer evidence and interpret such a resonance as a signature of nonequilibrium optical excitations resembling excitonic strings, (bi)excitons, and unbound doublon-holon pairs, depending on the magnitude of the intersite Coulomb repulsion. We discuss our results in the context of pump and probe spectroscopy experiments on organic Mott insulators.
- Research Organization:
- Northeastern University, Boston, MA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0014407
- OSTI ID:
- 1851916
- Journal Information:
- Physical Review. B, Journal Name: Physical Review. B Journal Issue: 8 Vol. 104; ISSN 2469-9950; ISSN PRBMDO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
1-dimensional systems
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Density matrix renormalization group
Excitons
Hubbard model
Materials Science
Optical conductivity
Photoinduced effect
Physics
Strongly correlated systems
Tensor network methods
Ultrafast optics
Ultrafast phenomena
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Density matrix renormalization group
Excitons
Hubbard model
Materials Science
Optical conductivity
Photoinduced effect
Physics
Strongly correlated systems
Tensor network methods
Ultrafast optics
Ultrafast phenomena