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Non-volatile electrical polarization switching via domain wall release in 3R-MoS2 bilayer
Dongyang Yang1,2, Jing Liang1,2, Jingda Wu1,2
1Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC, Canada.
Nature Communications
|February 15, 2024
Summary
Switchable polarization in bilayer molybdenum disulfide (MoS2) is linked to excitonic effects and domain wall dynamics. This research reveals how domain walls control polarization switching in rhombohedral MoS2, enabling optical response control.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Sliding ferroelectricity in two-dimensional (2D) materials is crucial for next-generation electronic devices.
- Understanding polarization switching mechanisms is key to harnessing ferroelectric properties in 2D materials.
Purpose of the Study:
- To investigate switchable polarization in bilayer molybdenum disulfide (MoS2) with rhombohedral stacking.
- To explore the coupling between spontaneous polarization and excitonic effects via asymmetric interlayer coupling.
- To elucidate the role of domain walls in polarization switching and optical response control.
Main Methods:
- Utilized optical spectroscopy and imaging techniques.
- Investigated a bilayer MoS2 system with natural rhombohedral stacking.
- Analyzed the influence of released domain walls on polarization switching.
Main Results:
- Observed switchable polarization coupled with excitonic effects in rhombohedral bilayer MoS2.
- Demonstrated that a released domain wall can switch the polarization of a large single domain.
- Highlighted the significant role of domain walls in polarization switching for non-twisted rhombohedral transition metal dichalcogenides.
Conclusions:
- Domain walls are critical for polarization switching in rhombohedral MoS2.
- The findings offer new pathways for non-volatile control of optical properties in 2D ferroelectric materials.
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