The Jahn–Teller (JT) effect, through geometric deformation of molecules or local ionic lattices, lowers the overall energy of the system by removing electron degeneracy from partially occupied orbitals. Crystal symmetry lowered by JT distortion inevitably creates multiple variants of elastic and orbital-anisotropic states. Visualization and control of the domain/wall textures create a cornerstone to understand various correlated phenomena and explore wall properties. Here, we report the real-space observation of JT phonon and orbiton-related domains in a LaMnO₃ thin film using confocal Raman spectromicroscopy. The characteristic symmetries of the JT-originated Raman modes allow us to detect and visualize the local population and orientation of the JT planes. Combined with a crystal structural analysis, we find that the formation of ferroelastic domains with W or W’ walls provides the basic framework for understanding JT domain textures. Furthermore, we demonstrate the JT domains can be manipulated by applying local external stress. Our findings provide a useful pathway for mechanically-tunable orbitronic applications.

Jahn-Teller (JT) 效应通过分子或局部离子晶格的几何变形，通过从部分占据的轨道中去除电子简并来降低系统的整体能量。JT 畸变降低了晶体对称性，不可避免地会产生多种弹性和轨道各向异性状态。域/墙壁纹理的可视化和控制为理解各种相关现象和探索墙壁特性奠定了基础。在这里，我们报告了 LaMnO ₃中 JT 声子和轨道子相关域的实空间观察薄膜使用共焦拉曼光谱。JT 产生的拉曼模式的特征对称性使我们能够检测和可视化 JT 平面的局部分布和方向。结合晶体结构分析，我们发现具有 W 或 W' 壁的铁弹性域的形成为理解 JT 域纹理提供了基本框架。此外，我们证明了可以通过施加局部外部应力来操纵 JT 域。我们的发现为机械可调轨道电子应用提供了一条有用的途径。