Chin. Phys. Lett. 38, 087701 (2021)
Narrow Waveguide Based on Ferroelectric Domain Wall
Gongzheng Chen1,2, Jin Lan1,3,*, Tai Min4, and Jiang Xiao1,2,5,*
1 Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China
2 Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
3 Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, Tianjin 300072, China
4 Center for Spintronics and Quantum System, State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
5 Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
* Corresponding authors: lanjin@tju.edu.cn xiaojiang@fudan.edu.cn
Abstract
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.
