Weyl Ferroelectric Semimetal

Author(s)
Ronghan Li, Yuanfeng Xu, Jianggang He, Sami Ullah, Jiangxiu Li, Jun-Ming Liu, Dianzhong Li, Hongming Weng, Cesare Franchini, Xing-Qiu Chen
Abstract

The recent discoveries of ferroelectric metal and Weyl semimetal (WSM) have stimulated a natural question: whether these two exotic states of matter can coexist in a single material or not. These two discoveries ensure us that physically it is possible since both of them share the same necessary condition, the broken inversion symmetry. Here, by using first-principles calculations, we demonstrate that the experimentally synthesized nonmagnetic HgPbO$_3$ represents a unique example of such hybrid "\emph{Weyl ferroelectric semimetal}". Its centrosymmetric $R\bar{3}c$ phase will undergo a ferroelectric phase transition to the ferroelectric $R3c$ structure. Both phases are metallic and the ferroelectric phase owns a spontaneous polarization of 33 $\mu$C/cm$^2$. Most importantly, it also harbors six pairs of chiral Weyl nodes around the Fermi level to be an oxide WSM. The structural symmetry broken phase transition induces a topological phase transition. The coexistence of ferroelectricity and Weyl nodes in HgPbO$_3$ is an ideal platform for exploring multiphase interaction and mutual control. The Weyl nodes can be tuned by external pulse electric field, which is promising for potential applications of integrated topotronic and ferroelectric devices.

Organisation(s)
Computational Materials Physics
Publication date
10-2016
Austrian Fields of Science 2012
103009 Solid state physics, 103015 Condensed matter, 103025 Quantum mechanics, 103036 Theoretical physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/weyl-ferroelectric-semimetal(ac89bbf7-ef33-4464-a7f6-2e2b91dec4a7).html