论文标题
极性非极性钙钛矿界面的倾斜和载体之间的耦合
Coupling between tilts and charge carriers at polar-nonpolar perovskite interfaces
论文作者
论文摘要
极性不稳定性的现象学理论在钙钛矿界面上引起了二维电子气体，从而扩展到包括与钙钛矿倾斜度的耦合。首先探索了一种同质倾斜的兰道理论，为进一步的，更现实的Landau-Ginzburg理论设定了一个场景，描述了一部薄膜中不同的倾斜度幅度。该理论还被推广以说明对界面正常的施加电场的响应，从而可以对相变的更精细的控制。传统描述的单个金属 - 绝缘体跃迁的物理学大大富含耦合，该模型描述了具有一个或两个过渡的各种场景，可能是连续或不连续的。第一原理计算允许估计定义模型的参数，该参数已计算为铝制型灯笼和钛酸腹膜之间的界面。
The phenomenological theory for the polar instability giving rise to a two-dimensional electron gas at perovskite interfaces is hereby extended to include the coupling to perovskite tilts. A Landau theory for homogeneous tilts is first explored, setting the scene for the further, more realistic Landau-Ginzburg theory describing varying tilt amplitudes across a thin film. The theory is also generalized to account for the response to an applied electric field normal to the interface, which allows a finer control on phase transitions. The conventionally described physics of a single metal-insulator transition is substantially enriched by the coupling, the model describing various scenarios with one or two transitions, possibly continuous or discontinuous. First-principles calculations permit the estimation of the parameters defining the model, which have been calculated for the interface between lanthanum aluminate and strontium titanate.
