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Oscillating edge states in one-dimensional MoS2 nanowires
Hai Xu1,2, Shuanglong Liu3, Zijing Ding3,4
1Department of Chemistry, National University of Singapore, 3 Science Driver 3, Singapore 117543, Singapore.
Nature Communications
|October 5, 2016
Summary
Strain in one-dimensional molybdenum disulfide (MoS2) nanowires causes edge state energy to oscillate. This effect disappears in wider nanoribbons, showing strain modulation depends on system size and rigidity.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- One-dimensional transition metal dichalcogenides exhibit unique electronic properties due to edge states.
- Charge density waves and quantum correlations are influenced by structural and electronic modulations in low-dimensional materials.
Purpose of the Study:
- To investigate the templated growth of molybdenum disulfide (MoS2) nanowire arrays.
- To explore the impact of substrate-induced strain on the electronic properties of MoS2 nanowires.
Main Methods:
- Scanning tunnelling microscopy (STM) was used to observe MoS2 nanowire arrays.
- Non-contact atomic force microscopy (AFM) was employed to analyze surface topography and strain effects.
Main Results:
- Lattice strain in MoS2 nanowires leads to periodic oscillations in edge state energy along the nanowire length.
- The observed oscillations are in phase with the substrate's topographical modulation.
- This strain-induced modulation diminishes as nanowires merge into wider nanoribbons.
Conclusions:
- The in-plane rigidity of MoS2 structures dictates the strain-induced modulation of edge states.
- System size significantly influences the interplay between curvature, strain, and electronic properties in MoS2 nanostructures.
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