Rotation of MO₆ (M = transition metal) octahedra is a key determinant of the physical properties of perovskite materials. Therefore, tuning physical properties, one of the most important goals in condensed matter research, may be accomplished by controlling octahedral rotation (OR). In this study, it is demonstrated that OR can be driven by an electric field in Sr₂RuO₄. Rotated octahedra in the surface layer of Sr₂RuO₄ are restored to the unrotated bulk structure upon dosing the surface with K. Theoretical investigation shows that OR in Sr₂RuO₄ originates from the surface electric field, which can be tuned via the screening effect of the overlaid K layer. This work establishes not only that variation in the OR angle can be induced by an electric field, but also provides a way to control OR, which is an important step toward in situ control of the physical properties of perovskite oxides.

MO ₆（M =过渡金属）八面体的旋转是钙钛矿材料物理性能的关键决定因素。因此，调节凝聚态研究中最重要的目标之一，即物理性质，可以通过控制八面体旋转（OR）来实现。在这项研究中，证明了OR可以由Sr ₂ RuO _4中的电场驱动。用K计量表面后，Sr ₂ RuO ₄表面层中的旋转八面体恢复为非旋转体结构。理论研究表明，Sr ₂ RuO _4中的OR源于表面电场，可以通过覆盖的K层的屏蔽效应对其进行调整。这项工作不仅确定了电场可以引起OR角的变化，而且提供了一种控制OR的方法，这是就地控制钙钛矿氧化物物理性能的重要一步。