In-Plane Sliding Ferroelectricity Realized in Penta-PdSe2/Penta-PtSe2 van der Waals Heterostructure
Source abstract
Abstract
Different from conventional 2D sliding ferroelectrics with polarization switchable in the out-of-plane via interlayer sliding, we show the existence of in-plane sliding ferroelectricity in a bilayer of a pentagon-based van der Waals heterostructure formed by vertically stacking an experimentally synthesized penta-PdSe 2 sheet and a crystal lattice well-matched penta-PtSe 2 sheet. From the 128 sliding patterns, four stable configurations are found that exhibit in-plane sliding ferroelectricity with an ultralow polarization switching barrier of 1.91 meV/atom and a high ferroelectric polarization of ±17.11 × 10 –10 C m –1 . Following the ferroelectric transition among the stable sliding configurations, significant changes in carrier mobility, electrical conductivity, and second harmonic generation are identified. In particular, the ferroelectric stacking configurations are found to possess a negative Poisson’s ratio, facilitating the experimental characterization of the sliding ferroelectric effect. This study demonstrates that pentagonal sheets can be used to realize 2D in-plane sliding ferroelectrics going beyond the existing ones.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: 2D Materials and Applications · Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering, CAPT, Peking University, Beijing 100871, China
Materials Genome Institute, Shanghai University, Shanghai 200444, China
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8577, Japan
Department of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India
Department of Physics, Institute for Sustainable Energy and Environment, Virginia Commonwealth University, Richmond, Virginia 23284, United States
Funding
Thailand Science Research and Innovation · Office of National Higher Education Science Research and Innovation Policy Council · Division of Materials Sciences and Engineering · Suranaree University of Technology · National Natural Science Foundation of China
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