| Autor: |
Nan Feng, Jian Han, Changpeng Lin, Zhengwei Ai, Chuwen Lan, Ke Bi, Yuanhua Lin, Kan-Hao Xue, Ben Xu |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
npj Computational Materials, Vol 8, Iss 1, Pp 1-7 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2057-3960 |
| DOI: |
10.1038/s41524-022-00901-9 |
| Popis: |
Abstract The Jahn-Teller (JT) effect involves the ions M with a degenerate electronic state distorting the corner-sharing MO6 octahedra to lift the degeneracy, inducing strong coupling of electrons to lattice, and mediating the exotic properties in perovskite oxides. Conversely, the anti-Jahn–Teller (AJT) effect refers to the deformation against the Jahn-Teller-distorted MO6 octahedra. However, it is difficult to experimentally execute both effects descending from the fine-tuning of crystal structures. We propose the AJT can be introduced by THz laser illumination at 11.71 THz in a candidate superconducting perovskite material BaBiO3 near room temperature. The illumination coherently drives the infrared-active phonon that excites the Raman breathing mode through the quadratic-linear nonlinear interaction. The process is characterized by the emergence of an AJT effect, accompanied by an insulator-to-metal transition occurring on the picosecond timescale. This study underlines the important role of crystal structure engineering by coherent phonon excitation in designing optoelectronic devices. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
Full text from SpringerLink