Photoinduced absorptions inside the Mott gap in the two-dimensional extended Hubbard model

We theoretically investigate pump-probe optical responses in the two-dimensional extended Hubbard model describing cuprates by using a time-dependent Lanczos method. At half filling, pumping generates photoinduced absorptions inside the Mott gap. A part of low-energy absorptions is attributed to the...

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Bibliographic Details
Published in:Physical review. B 2017-11, Vol.96 (19), Article 195141
Main Authors: Shinjo, Kazuya, Tohyama, Takami
Format: Article
Language:English
Subjects:
Cuprates
Optical pumping
Time dependence
Two dimensional models
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Summary:We theoretically investigate pump-probe optical responses in the two-dimensional extended Hubbard model describing cuprates by using a time-dependent Lanczos method. At half filling, pumping generates photoinduced absorptions inside the Mott gap. A part of low-energy absorptions is attributed to the independent propagation of photoinduced holons and doublons. The spectral weight just below the Mott gap increases with decreasing the on-site Coulomb interaction U. We find that the next-nearest-neighbor Coulomb interaction V1 enhances this U dependence, indicating the presence of biexcitonic contributions formed by two holon-doublon pairs. Photopumping in hole-doped systems also induces spectral weights below remnant Mott-gap excitations, being consistent with recent experiments. The induced weights are less sensitive to V1 and may be related to the formation of a biexcitonic state in the presence of hole carriers.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.195141