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Ballistic tracks in graphene nanoribbons
Johannes Aprojanz1, Stephen R Power2,3,4, Pantelis Bampoulis5,6
1Institut für Physik, Technische Universität Chemnitz, 09126, Chemnitz, Germany.
Researchers imaged individual transport modes in graphene nanoribbons on silicon carbide (SiC). This reveals precise control over multiple ballistic tracks for future quantum devices.
Area of Science:
- Condensed matter physics
- Materials science
- Nanoelectronics
Background:
- Epitaxially grown graphene nanoribbons on silicon carbide (SiC) are crucial for nanoelectronics.
- These ribbons exhibit 1D single-channel ballistic transport at room temperature with long mean free paths.
Purpose of the Study:
- To selectively access and image individual transport modes in sidewall graphene nanoribbons.
- To investigate the underlying physics governing transport behavior.
Main Methods:
- Spatially-resolved two-point probe (2PP) measurements were employed.
- Individual transport channels were selectively contacted and analyzed.
Main Results:
- Quantized conductance plateaus were observed for different probe positions, indicating independently contacted channels.
- The transport behavior is influenced by edge magnetism and asymmetric ribbon terminations due to SiC morphology.
Conclusions:
- Demonstrated precise control over multiple independent ballistic transport tracks in graphene nanoribbons.
- Opened new possibilities for developing quantum information devices based on controlled electron transport.
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