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Anisotropy induced Kondo splitting in a mechanically stretched molecular junction: A first-principles based study
Xiaoli Wang1, Dong Hou1, Xiao Zheng1
1Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
The Journal of Chemical Physics
|January 24, 2016
Summary
Mechanical stretching of magnetic molecular junctions influences magnetic anisotropy and Kondo phenomena. Combining density functional theory (DFT) and hierarchical equations of motion (HEOM) reveals sensitivity to structural changes.
Area of Science:
- Condensed Matter Physics
- Molecular Electronics
- Computational Chemistry
Background:
- Magnetic molecular junctions offer tunable electronic and magnetic properties.
- Mechanical control over molecular junctions is crucial for advanced electronic devices.
- Understanding electron correlations and magnetic anisotropy is key to molecular magnetism.
Purpose of the Study:
- Investigate magnetic anisotropy and Kondo phenomena in mechanically stretched magnetic molecular junctions.
- Explore the impact of structural distortion on magnetic and electronic properties.
- Validate the combined density functional theory (DFT) and hierarchical equations of motion (HEOM) approach.
Main Methods:
- Density Functional Theory (DFT) for electronic structure and mechanical properties.
- Hierarchical Equations of Motion (HEOM) for Kondo resonance features.
- Anderson impurity model parameterized from DFT results.
Main Results:
- Confirmed S = 1 local spin state preference.
- Systematically evaluated structural properties, magnetic anisotropy, and Kondo peak splitting under axial stretching.
- Demonstrated strong electron correlations and local magnetic properties are sensitive to structural distortion.
Conclusions:
- The combined DFT+HEOM approach is effective for studying mechanically controlled molecular junctions.
- Mechanical stretching significantly alters magnetic anisotropy and Kondo phenomena.
- This research provides insights for designing novel molecular electronic devices.
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