Low-energy interband transition in the infrared response of the correlated metal SrVO3 in the ultraclean limit
- Authors
- Ahn, Gihyeon; Zingl, Manuel; Noh, S.J.; Brahlek, Matthew J.; Roth, Joseph D.; Engel-Herbert, Roman; Millis, Andrew J.; Moon, Soonjae
- Issue Date
- Aug-2022
- Publisher
- American Physical Society
- Citation
- Physical Review B, v.106, no.8, pp.1 - 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- Physical Review B
- Volume
- 106
- Number
- 8
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/186092
- DOI
- 10.1103/PhysRevB.106.085133
- ISSN
- 2469-9950
- Abstract
- We studied the low-energy electronic response of the prototypical correlated metal SrVO3 in the ultraclean and disordered limit using infrared spectroscopy and density functional theory plus dynamical mean field theory calculations (DFT+DMFT). A strong optical excitation at 70 meV is observed in the optical response of the ultraclean samples but is hidden by the low-energy Drude-like response from intraband excitations in the more disordered samples. DFT+DMFT calculations reveal that this optical excitation originates from interband transitions between the bands split by orbital off-diagonal hopping, which has often been ignored in cubic systems, such as SrVO3. A memory function analysis of the optical data shows that this interband transition can lead to deviations of optical self-energy from the expected Fermi-liquid behavior. Our findings demonstrate that analysis schemes employed to extract many-body effects from optical spectra may be oversimplified to study the true electronic ground state and that improvements in material quality can guide efforts to refine theoretical approaches.
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