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An elemental ferroelectric topological insulator in ψ-bismuthene
Xuening Han1, Fulu Zheng2, Thomas Frauenheim3
1College of Physics and Optoelectronic Engineering, Faculty of Information Science and Engineering, Ocean University of China, Songling Road 238, Qingdao 266100, People's Republic of China. yliang.phy@ouc.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|October 14, 2024
Summary
Researchers discovered a novel two-dimensional elemental ferroelectric quantum spin Hall insulator (FEQSHI). This material, ψ-bismuthene, exhibits ferroelectricity and protected edge states, paving the way for advanced electronic applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Topological Materials
Background:
- Ferroelectric quantum spin Hall insulators (FEQSHIs) are rare, especially elemental 2D candidates.
- FEQSHIs combine ferroelectricity with time-reversal symmetry protected edge states.
- These materials offer potential for novel scientific insights and technological applications.
Purpose of the Study:
- To identify and characterize a two-dimensional elemental FEQSHI.
- To explore the potential of ψ-bismuthene for topological and ferroelectric phenomena.
- To investigate auxetic behavior, quantum transport, and spin properties.
Main Methods:
- Theoretical investigation of bilayer Bi (110) allotrope, termed ψ-bismuthene.
- Analysis of electronic band structure and ferroelectric polarization.
- Simulation of quantum transport and spin-related phenomena.
Main Results:
- ψ-bismuthene identified as a 2D elemental FEQSHI.
- Demonstrated measurable ferroelectric polarization and a nontrivial band gap.
- Observed auxetic behavior and ferroelectric controllable persistent spin helix.
Conclusions:
- ψ-bismuthene is a promising material for studying ferroelectric topological states.
- Its unique properties make it suitable for fundamental physics research and technological innovation.
- Elemental FEQSHIs open new avenues in advanced materials design.
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