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

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 < ~0.7 Å^-1). Here, we show that long-lived flat plasmons can propagate up to ~1.2 Å^-1 in α-Ti₂O₃, a strongly correlated three-dimensional Mott-insulator, with an ultra-small energy fluctuation (<40 meV). The strong correlation effect renormalizes the electronic bands near Fermi level with a small b

SUBMITTER: Gao H 

PROVIDER: S-EPMC9363501 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature