Controlling toroidal moment by means of an inhomogeneous static field: An ab initio study
Controlling toroidal moment by means of an inhomogeneous static field: An ab initio study
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DOI：
10.1103/physrevlett.96.237601
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发表时间：
2006-06-16
影响因子：
8.6
通讯作者：
Bellaiche, L.
中科院分区：
文献类型：
--
作者：
Prosandeev, S.;Ponomareva, I.;Bellaiche, L.
基于第一性原理的方法用于显示（i）在类似开路的电边界条件下的无应力铁电纳米点在受到横向不均匀静电场时保持其局部偶极子的涡旋结构，并且更重要的是，（ii）这样的场导致基本和技术挑战的解决方案：即，宏观环向力矩方向的有效控制。负责这种引人注目的功能的影响被揭示和讨论。
A first-principles-based approach is used to show (i) that stress-free ferroelectric nanodots under open-circuit-like electrical boundary conditions maintain a vortex structure for their local dipoles when subject to a transverse inhomogeneous static electric field, and, more importantly, (ii) that such a field leads to the solution of a fundamental and technological challenge: namely, the efficient control of the direction of the macroscopic toroidal moment. The effects responsible for such striking features are revealed and discussed.