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Ultra-flat and long-lived plasmons in a strongly correlated oxide

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Title
Ultra-flat and long-lived plasmons in a strongly correlated oxide
Author(s)
Gao, Han; Ding, Chao; Jaeseok Son; Zhu, Yangyu; Wang, Mingzheng; Yu, Zhi Gen; Chen, Jianing; Wang, Le; Chambers, Scott A.; Tae Won Noh; Zhao, Mingwen; Li, Yangyang
Publication Date
2022-08
Journal
NATURE COMMUNICATIONS, v.13, no.1
Publisher
NATURE PORTFOLIO
Abstract
Plasmons in strongly correlated systems are attracting considerable attention due to their unconventional behavior caused by electronic correlation effects. Recently, flat plasmons with nearly dispersionless frequency-wave vector relations have drawn significant interest because of their intriguing physical origin and promising applications. However, these flat plasmons exist primarily in low-dimensional materials with limited wave vector magnitudes (q < similar to 0.7 angstrom(-1)). Here, we show that long-lived flat plasmons can propagate up to similar to 1.2 angstrom(-1) in alpha-Ti2O3 , a strongly correlated three-dimensional Mottinsulator, with an ultra-small energy fluctuation (<40 meV). The strong correlation effect renormalizes the electronic bands near Fermi level with a small bandwidth, which is responsible for the flat plasmons in alpha-Ti2O3. Moreover, these flat plasmons are not affected by Landau damping over a wide range of wave vectors (q < similar to 1.2 angstrom(-1)) due to symmetry constrains on the electron wavefunctions. Our work provides a strategy for exploring flat plasmons in strongly correlated systems, which in turn may give rise to novel plasmonic devices in which flat and long-lived plasmons are desirable.
URI
https://pr.ibs.re.kr/handle/8788114/12350
DOI
10.1038/s41467-022-32359-0
ISSN
2041-1723
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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