Graphene-based integrated electronic, photonic and spintronic circuit

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Proceedings titleSPIE - International Society for Optical Engineering. Proceedings
Conference2013 Micro- and Nanotechnology Sensors, Systems, and Applications V Conference, 29 April 2013 through 3 May 2013, Baltimore, MD
Article number87250G
SubjectElectric and magnetic fields; Electrical field; Electronic nanodevices; Ferromagnetic orders; Integrated electronics; Semiconductor nanoparticles; Spatial confinement; Spintronic circuits; Absorption spectroscopy; Energy gap; Graphene; Magnetic moments; Magnetic properties; Magnetoelectronics; Nanostructured materials; Nanotechnology; Optical properties; Photons; Semiconductor quantum dots; Sensors; Solids; Photonic integration technology
AbstractTo create carbon-based nanoscale integrated electronic, photonic, and spintronic circuit one must demonstrate the three functionalities in a single material, graphene quantum dots (GQDs), by engineering lateral size, shape, edges, number of layers and carrier density. We show theoretically that spatial confinement in GQDs opens an energy gap tunable from UV to THz, making GQDs equivalent to semiconductor nanoparticles. When connected to leads, GQDs act as single-electron transistors. The energy gap and absorption spectrum can be tuned from UV to THz by size and edge engineering and by external electric and magnetic fields. The sublattice engineering in, e.g., triangular graphene quantum dots (TGQDs) with zigzag edges generates a finite magnetic moment. The magnetic moment can be controlled by charging, electrical field, and photons. Addition of a single electron to the charge-neutral system destroys the ferromagnetic order, which can be restored by absorption of a photon. This allows for an efficient spin-photon conversion. These results show that graphene quantum dots have potential to fulfill the three functionalities: electronic, photonic, and spintronic, realized with different materials in current integrated circuits, as well as offer new functionalities unique to graphene. © 2013 SPIE.
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AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270574
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Record identifier9b2e54bd-2c21-4484-b783-4cf3d03fe6b9
Record created2014-02-17
Record modified2017-04-24
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