Anti-Jahn-Teller effect induced ultrafast insulator to metal transition in perovskite BaBiO_(3)  

作　　者：Nan Feng Jian Han Changpeng Lin Zhengwei Ai Chuwen Lan Ke Bi Yuanhua Lin Kan-Hao Xue Ben Xu 

机构地区：[1]State Key Laboratory of Information Photonics and Optical Communications,School of Science,Beijing University of Posts and Telecommunications,100876,Beijing,China [2]Graduate School of China Academy of Engineering Physics,100193,Beijing,China [3]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,100084,Beijing,China [4]Theory and Simulation of Materials(THEOS),École Polytechnique Fédérale de Lausanne,CH-1015,Lausanne,Switzerland [5]School of Integrated Circuits,School of Optical and Electronic Information,Huazhong University of Science and Technology,430074,Wuhan,China

出　　处：《npj Computational Materials》2022年第1期2148-2154,共7页计算材料学（英文）

基　　金：This work was supported by the Fundamental Research Funds for the Central Universities(grant no.2021XD-A06-1);National Natural Science Foundation of China(grant nos.51790494,12088101,52072209,51972033,and U2241243);Beijing Natural Science Foundation(grant No.JQ22010).

摘　　要：The Jahn-Teller(JT)effect involves the ions M with a degenerate electronic state distorting the corner-sharing MO_(6)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 MO_(6)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 BaBiO_(3)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.

关 键 词：tuning effect ILLUMINATION 

分 类 号：TB31[一般工业技术—材料科学与工程]