Narrow Waveguide Based on Ferroelectric Domain Wall

Ferroelectric materials are spontaneous symmetry breaking systems that are characterized by ordered electric polarizations.Similar to its ferromagnetic counterpart,a ferroelectric domain wall can be regarded as a soft interface separating two different ferroelectric domains.Here we show that two bound state excitations of electric polarization(polar wave),or the vibration and breathing modes,can be hosted and propagate within the ferroelectric domain wall.In particular,the vibration polar wave has zero frequency gap,thus is constricted deeply inside ferroelectric domain wall,and can even propagate in the presence of local pinnings.The ferroelectric domain wall waveguide as demonstrated here offers a new paradigm in developing ferroelectric information processing units.

关联电子材料的自旋态限域调控与自旋电子器件应用研究进展

关联电子材料具有丰富的自旋序,包括铁磁、反铁磁、亚铁磁、螺旋磁序等,这些自旋序与电子轨道态、电荷空间分布等其他量子态存在强烈耦合,因而可以通过外场来实现不同自旋序的时域和空域调控。相对于存在化学界面的传统异质结构,在关联电子材料中利用外场限域调控,可以实现无化学界面的不同自旋序结构的空间可控排列,从而构筑基于同一材料的新型自旋电子器件。本项目围绕关联电子体系多量子态的调控规律展开,通过自旋电子学与量子物理、表面物理以及电介质物理的交叉,探索具有多场(磁场、电场、光场、应变场)可控性的新型关联自旋电子材料,发展新型的多场调控技术,揭示自旋序与量子态耦合机理,设计新型自旋电子器件,进而实现在同一关联电子材料中集成非挥发性自旋存储与逻辑运算功能。