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

Gao, Han; Ding, Chao; Son, Jaeseok; Zhu, Yangyu; Wang, Mingzheng; Yu, Zhi Gen; Chen, Jianing; Wang, Le; Chambers, Scott A; Noh, Tae Won; Zhao, Mingwen; Li, Yangyang

Gao, Han; Ding, Chao; Son, Jaeseok; Zhu, Yangyu; Wang, Mingzheng; Yu, Zhi Gen; Chen, Jianing; Wang, Le; Chambers, Scott A; Noh, Tae Won; Zhao, Mingwen; Li, Yangyang.

Afiliación

Gao H; School of Physics, Shandong University, Jinan, 250100, Shandong, China.
Ding C; School of Physics, Shandong University, Jinan, 250100, Shandong, China.
Son J; Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea.
Zhu Y; Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Republic of Korea.
Wang M; School of Physics, Shandong University, Jinan, 250100, Shandong, China.
Yu ZG; School of Physics, Shandong University, Jinan, 250100, Shandong, China.
Chen J; Institute of High Performance Computing, Singapore, 138632, Singapore.
Wang L; Institute of Physics, Chinese Academy of Science and Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China.
Chambers SA; Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA.
Noh TW; Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA.
Zhao M; Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea.
Li Y; Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Republic of Korea.

Nat Commun ; 13(1): 4662, 2022 Aug 09.

Article en En | MEDLINE | ID: mdl-35945225

RESUMEN

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 bandwidth, which is responsible for the flat plasmons in α-Ti2O3. Moreover, these flat plasmons are not affected by Landau damping over a wide range of wave vectors (q < ~1.2 Å-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.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2022 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido

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