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Mach-Zehnder-like interferometry with graphene nanoribbon networks
Sofia Sanz1, Nick Papior2, Géza Giedke1,3
1Donostia International Physics Center (DIPC), E-20018 Donostia-San Sebastián, Spain.
Summary
We theoretically investigated electron interference in graphene nanoribbons, creating tuneable beam splitters and mirrors. This enables novel sensors and quantum entanglement studies by controlling electron pathways.
Area of Science:
- Condensed Matter Physics
- Quantum Electronics
- Materials Science
Background:
- Mach-Zehnder interferometry is crucial for quantum phenomena.
- Graphene nanoribbons offer unique electronic properties for device applications.
Purpose of the Study:
- To theoretically explore electron interference in a novel graphene nanoribbon geometry.
- To design tuneable electronic circuits for quantum applications.
Main Methods:
- Utilizing the mean-field Hubbard model and Green's function techniques.
- Employing scattering matrix formalism for simplified analysis.
- Investigating electron transport properties in an eight-terminal device.
Main Results:
- Demonstrated tuneable beam splitter and mirror functionalities at ribbon intersections.
- Identified self-interference phenomena between specific device terminals.
- Validated scattering matrix results against Green's function calculations.
Conclusions:
- The proposed graphene nanoribbon geometry enables tuneable circuitry for quantum interference.
- Devices show sensitivity to magnetic flux (Aharonov-Bohm effect) and geometric variations.
- Potential applications include magnetic field sensors, phase shift detectors, and quantum entanglement studies.
