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Published on: October 12, 2019
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Engineering band structures of two-dimensional materials with remote moiré ferroelectricity
Jing Ding1,2,3, Hanxiao Xiang1,2,3, Wenqiang Zhou2,3
1Department of Physics, Fudan University, Shanghai, 200433, China.
Nature Communications
|October 21, 2024
Summary
Engineers can imprint remote moiré potentials onto bilayer graphene using twisted transition metal dichalcogenides. This novel approach tunes graphene
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Stacking order and twist angle in 2D materials enable band structure engineering, creating moiré, flat, and topological bands.
- Rhombohedral-stacked transition metal dichalcogenides exhibit interfacial ferroelectricity due to broken inversion symmetry, leading to out-of-plane polarization.
- Antiferroelectric domain networks with alternating polarization can be generated by controlling the twist angle in these materials.
Purpose of the Study:
- To demonstrate the remote imprinting of moiré potential from ferroelectric twisted WSe2 onto bilayer graphene.
- To investigate the tunability of this remote moiré potential by adjusting the twist angle.
- To explore the potential of moiré ferroelectricity for flexible superlattice construction and band structure engineering.
Main Methods:
- Fabrication of parallel-stacked twisted WSe2 structures.
- Measurement of electrical transport properties in a remote bilayer graphene layer.
- Analysis of resistance peaks and ferroelectric hysteresis to confirm the long-range electrostatic potential.
Main Results:
- Spatially periodic ferroelectric polarizations in twisted WSe2 imprint a tunable remote moiré potential onto bilayer graphene.
- Pronounced satellite resistance peaks observed in graphene, tunable via the WSe2 twist angle, indicating the presence of the moiré potential.
- Ferroelectric hysteresis confirms the moiré is mediated by a long-range electrostatic interaction.
Conclusions:
- Moiré ferroelectricity provides a flexible method for creating superlattices by separating the moiré generation layer from the electronic transport layer.
- The demonstrated remote moiré potential is a weak interaction that can coexist with conventional moiré effects.
- This approach offers a comprehensive strategy for engineering the band structures and properties of 2D materials.
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