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Shear Strain-Induced Two-Dimensional Slip Avalanches in Rhombohedral MoS2
Jing Liang1,2, Dongyang Yang1,2, Yunhuan Xiao1,2
1Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada.
Nano Letters
|June 26, 2023
Summary
Researchers observed two-dimensional (2D) slip avalanches in molybdenum disulfide (MoS2) triggered by shear strain. This finding reveals how strain impacts 2D material structure and properties.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Slip avalanches are well-understood in 3D materials, impacting plastic deformation and fragmentation.
- The behavior of slip avalanches in two-dimensional (2D) materials under shear strain remains largely unexplored.
- Understanding shear strain effects is crucial for manipulating 2D material properties.
Purpose of the Study:
- To investigate the occurrence and characteristics of slip avalanches in 2D materials.
- To explore the influence of shear strain on the stacking order of 2D materials.
- To provide insights into the fundamental physical phenomena governing 2D material behavior.
Main Methods:
- Experimental observation of slip avalanches in exfoliated rhombohedral molybdenum disulfide (MoS2).
- Application of shear strain near the threshold level to trigger avalanches.
- Utilizing interfacial polarization in 3R-MoS2 to probe stacking order in multilayer flakes.
Main Results:
- Evidence of two-dimensional (2D) slip avalanches triggered by shear strain in MoS2 was observed.
- A diverse range of polarization domains with sizes following a power-law distribution were discovered.
- The study indicates that shear strain can alter the stacking order of 2D materials.
Conclusions:
- Slip avalanches can occur during the exfoliation process of 2D materials.
- Shear strain plays a significant role in modifying the stacking order and atomic structure of 2D materials.
- These findings have critical implications for designing new materials and technologies requiring precise structural control.
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