论文标题
滑动诱导的多个极化状态在二维铁电体中
Sliding induced multiple polarization states in two-dimensional ferroelectrics
论文作者
论文摘要
当非中心对称范德华结构相互滑动时的原子层时，界面电荷转移会导致结构自发极化的逆转。该现象被称为滑动铁电性，它与依靠离子位移的常规铁电交换机制明显不同。在这里，我们将层依赖性作为控制滑动铁电性的新维度。通过将各种厚度的3R MOS2制造成双门栅场效应晶体管，我们获得了多层3R MOS2中的异常中间极化状态。利用从头算密度函数理论计算的结果，我们提出了一个广义模型，以描述多层3R MOS2中的铁电交换过程，并解释这些中间极化状态的形成。这项工作揭示了层数和层间偶极子耦合在滑动铁电性中的关键作用，并提出了一种新型滑动铁电设备设计的新策略。
When the atomic layers in a non-centrosymmetric van der Waals structure slide against each other, the interfacial charge transfer results in a reversal of the structures spontaneous polarization. This phenomenon is known as sliding ferroelectricity and it is markedly different from conventional ferroelectric switching mechanisms relying on ion displacement. Here, we present layer dependence as a new dimension to control sliding ferroelectricity. By fabricating 3R MoS2 of various thicknesses into dual-gate field-effect transistors, we obtain anomalous intermediate polarization states in multilayer 3R MoS2. Using results from ab initio density functional theory calculations, we propose a generalized model to describe the ferroelectric switching process in multilayer 3R MoS2 and to explain the formation of these intermediate polarization states. This work reveals the critical roles that layer number and interlayer dipole coupling play in sliding ferroelectricity and presents a new strategy for the design of novel sliding ferroelectric devices.
