Functional ferroic heterostructures with tunable integral symmetry
Functional ferroic heterostructures with tunable integral symmetry
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DOI：
10.1038/ncomms5295
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发表时间：
2014-07-01
影响因子：
16.6
通讯作者：
Meier, D.
中科院分区：
文献类型：
--
作者：
Becher, C.;Trassin, M.;Meier, D.
皮埃尔·居里（Pierre Curie）指出了对称性和功能性之间的关系，他指出，正是对称性的破坏创造了物理特性。这一基本原理现在被用于工程异质结构，其整体对称性导致诸如单向透明之类的奇异现象。然而，对于开关器件，这种对称性相关的功能不能被使用，因为一旦材料被合成，传统异质结构中的对称性是不可改变的。在这里，我们展示了PbZr0.2Ti0.8O3和bifeo3基异质结构中生长后对称控制的概念。导电氧化物夹在两个铁电层之间，通过层选择电场极化可逆地开启或关闭反转对称性。讨论了我们的方法在其他材料和对称中的推广。因此，我们建立了具有可逆可调对称性的铁三层结构作为器件组件，并演示了它们作为可以通过施加适度电压激活和停用的光源的使用。
The relation between symmetry and functionality was pinpointed by Pierre Curie who stated that it is the symmetry breaking that creates physical properties. This fundamental principle is nowadays used for engineering heterostructures whose integral symmetry leads to exotic phenomena such as one-way transparency. For switching devices, however, such symmetry-related functionalities cannot be used because the symmetry in conventional heterostructures is immutable once the material has been synthesized. Here we demonstrate a concept for post-growth symmetry control in PbZr0.2Ti0.8O3 and BiFeO3-based heterostructures. A conducting oxide is sandwiched between two ferroelectric layers, and inversion symmetry is reversibly switched on or off by layer-selective electric-field poling. The generalization of our approach to other materials and symmetries is discussed. We thus establish ferroic trilayer structures as device components with reversibly tunable symmetry and demonstrate their use as light emitters that can be activated and deactivated by applying moderate electric voltages.