Local correlations necessitate waterfalls as a connection between quasiparticle band and developing Hubbard bands
2024
Understanding Waterfalls in Quasiparticle Bands
publication
Evidence: high
Author Information
Author(s): Krsnik Juraj, Held Karsten
Primary Institution: Institute of Solid State Physics, TU Wien, Austria
Hypothesis
Do waterfalls in angle-resolved photoemission spectra originate from the coupling of Hubbard bands and quasiparticle bands?
Conclusion
The study provides a natural explanation for the spectral anomalies known as waterfalls in correlated materials like cuprates and nickelates.
Supporting Evidence
- Waterfalls are observed in angle-resolved photoemission spectra of cuprates and nickelates.
- The study shows that waterfalls occur naturally when a Hubbard band develops and splits from the quasiparticle band.
- Good agreement was found between experimental spectra and the Hubbard model with ab initio parameters.
Takeaway
Waterfalls are strange shapes seen in certain materials when looking at their energy levels, and this study shows they happen when a specific band splits off from another.
Methodology
The authors used dynamical mean-field theory to analyze the emergence of waterfalls in the Hubbard model.
Digital Object Identifier (DOI)
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