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Transport in multiterminal graphene nanodevices
Thushari Jayasekera1, J W Mintmire
1Department of Physics, Oklahoma State University, Stillwater, OK 74078, USA.
Nanotechnology
|July 7, 2011
Summary
Transport properties of multiterminal graphene nanodevices depend on junction geometry. A cross-junction shows a conductance dip in armchair leads and a peak in zigzag leads, enhanced in T-junctions.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Graphene nanoribbons exhibit unique electronic properties.
- Understanding transport in multiterminal graphene devices is crucial for nanoelectronic applications.
- Device geometry significantly influences electron transport characteristics.
Purpose of the Study:
- To investigate the transport properties of multiterminal graphene nanodevices.
- To analyze the impact of junction geometry on conductance.
- To compare transport behavior in cross-junction and T-junction configurations.
Main Methods:
- Utilized the Landauer-Buttiker approach for transport calculations.
- Employed the tight-binding model for electronic structure.
- Simulated four-terminal devices at nanoribbon crossings and T-junctions.
Main Results:
- Transport properties are highly sensitive to junction region details.
- Observed a conductance dip in the armchair lead and a conductance peak in the zigzag lead for a cross-junction device.
- This effect is amplified in a T-junction device with an armchair sidearm.
Conclusions:
- The specific arrangement of graphene nanoribbons at junctions dictates unique transport phenomena.
- T-junctions with armchair components show enhanced sensitivity in conductance variations.
- Findings provide insights for designing graphene-based electronic components.
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