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Topological phonons in oxide perovskites controlled by light
Bo Peng1, Yuchen Hu1,2, Shuichi Murakami3,4
1Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, UK.
Science Advances
|November 12, 2020
Summary
Topological phonons, including nodal rings, lines, and Weyl points, are widespread in perovskite oxides. Photoexcitation in these materials can induce and tune these topological states, offering new avenues for light-controlled topological devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Perovskite oxides possess diverse structural phases and physical phenomena, leading to various technological applications.
- Topological phonons, such as nodal rings, nodal lines, and Weyl points, are crucial for understanding exotic quantum phenomena in materials.
Purpose of the Study:
- To investigate the ubiquity and tunability of topological phonons in perovskite oxides.
- To explore the role of external conditions, particularly photoexcitation, in controlling topological phonon states.
Main Methods:
- Theoretical investigation of topological phonon properties in various perovskite oxide structures (tetragonal, orthorhombic, rhombohedral).
- Analysis of specific compounds like Barium Titanate (BaTiO3), Lead Titanate (PbTiO3), and Strontium Titanate (SrTiO3).
- Examination of the effects of photoexcitation, strain, and temperature on topological phonon states.
Main Results:
- Topological phonons are found to be ubiquitous across different structures, compounds, and external conditions in oxide perovskites.
- In the tetragonal phase, photoexcitation enables the simultaneous emergence of all topological phonon types, unlike thermal fluctuations.
- Photoexcited carrier concentration effectively tunes topological phonon states and induces transitions, independent of structural changes.
Conclusions:
- Oxide perovskites serve as a versatile platform for studying topological phonons.
- Light-induced control over topological phonon states offers promising prospects for novel optoelectronic and topological devices.
