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Updated: May 23, 2026
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Fabrication of Spatially Confined Complex Oxides
Published on: July 1, 2013
Polymorphic phase engineering of flat plasmons in a correlated oxide.
Yangyu Zhu1, Xuejin Zhang1, Jaeseok Son2
1School of Physics, Shandong University, Jinan 250100, China. zmw@sdu.edu.cn.
Nanoscale
|May 22, 2026
Summary
Researchers engineered flat plasmons in titanium sesquioxide (Ti2O3) by tuning electronic correlations. This breakthrough enables manipulation of flat plasmons in strongly correlated systems for advanced optical devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Optics
Background:
- Flat plasmons, exhibiting dispersionless and long-lived behavior, are crucial for advanced imaging and nonlinear optics.
- Conventional flat plasmons are limited to low-dimensional systems and restricted momentum regions (< ~0.7 Å⁻¹).
Purpose of the Study:
- To report the emergence and engineering of flat plasmons in the strongly correlated oxide Ti₂O₃.
- To investigate the role of electronic correlation effects in manipulating plasmon properties.
Main Methods:
- Polymorphic phase-engineering of Ti₂O₃ through epitaxial stabilization.
- Tuning the on-site Coulomb interaction (U) to modify plasmon energy fluctuations (Δωₚ).
Main Results:
- Demonstrated highly anisotropic and long-lived flat plasmons in Ti₂O₃ at higher momentum regions (> 0.7 Å⁻¹).
- Established a direct relationship between increased electronic correlation (U) and reduced plasmon energy fluctuation (Δωₚ), leading to flatter plasmons.
- Attributed plasmon flattening to renormalized bandwidth of Hubbard bands.
Conclusions:
- Electronic correlations in strongly correlated oxides can be leveraged to engineer flat plasmons.
- This provides a practical strategy for manipulating flat plasmons, advancing plasmonic and nonlinear optical device development.
