Anomalous Temperature Dependence of High-Harmonic Generation in Mott Insulators
| Autor: | Yuta Murakami, Kento Uchida, Akihisa Koga, Koichiro Tanaka, Philipp Werner |
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| Rok vydání: | 2022 |
| Předmět: |
Condensed Matter - Strongly Correlated Electrons
Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Strongly Correlated Electrons (cond-mat.str-el) Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Physics::Atomic and Molecular Clusters Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Physics and Astronomy Physics::Atomic Physics |
| Zdroj: | Physical Review Letters. 129 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | We reveal the crucial effect of strong spin-charge coupling on high-harmonic generation (HHG) in Mott insulators. In a system with antiferromagnetic correlations, the HHG signal is drastically enhanced with decreasing temperature, even though the gap increases and the production of charge carriers is suppressed. This anomalous behavior, which has also been observed in recent HHG experiments on Ca$_2$RuO$_4$, originates from a cooperative effect between the spin-charge coupling and the thermal ensemble, and the strongly temperature-dependent coherence between charge carriers. We argue that the peculiar temperature dependence of HHG is a generic feature of Mott insulators, which can be controlled via the Coulomb interaction and dimensionality of the system. Our results demonstrate that correlations between different degrees of freedom, which are a characteristic feature of strongly correlated solids, have significant and nontrivial effects on nonlinear optical responses. Comment: 6 pages, 4 figures + 9 pages, 12 figures |
| Databáze: | OpenAIRE |
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