Work

Ferroelectrovalley in Two-Dimensional Multiferroic Lattices

Year: 2024

Type: article

Abstract: Engineering the valley index is essential and highly sought for valley physics, but currently, it is exclusively based on the paradigm of the challenging ferrovalley with spin-orientation reversal under a magnetic field. Here, an alternative strategy, i.e., the so-called ferroelectrovalley, is proposed to tackle the insurmountable spin-orientation reversal, which reverses the valley index with the feasible ferroelectricity. Using symmetry arguments and the tight-binding model, the C 2 z rotation is unveiled to be able to take the place of time reversal for operating the valley index in two-dimensional multiferroic kagome lattices, which enables a ferroelectricity-engineered valley index, thereby generating the concept of a ferroelectrovalley. Based on first-principles calculations, this concept is further demonstrated in the breathing kagome lattice of single-layer Ti 3 Br 8, wherein ferroelectricity couples with the breathing process. These findings open a new direction for valleytronics and 2D materials research.

Source: Nano Letters

DOI: 10.1021/acs.nanolett.4c02277

Authors: Jiangyu Zhao, Yangyang Feng, Ying Dai, Baibiao Huang, Yandong Ma

Institutions: Shandong University, State Key Laboratory of Crystal Materials

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, Taishan Scholar Project of Shandong Province, Qingchuang Talents Induction Program of Shandong Higher Education Institution

Awards: G1733897587, G3357958796, G6545783681