Dual function armchair graphene nanoribbon-based spin-photodetector: Optical spin-valve and light helicity detector

Journal Article · Mon Aug 18 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4893604· OSTI ID:22310891

Ostovari, Fatemeh ^[1]

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1. Department of Physics, Tarbiat Modares University, P.O. Box 14115-335, Tehran 1411713116 (Iran, Islamic Republic of)

We show an armchair graphene nanoribbon channel connected between asymmetric ferromagnetic source-drain structure—i.e., p-type Co/Au/graphene source and n-type Co/Cu/graphene drain—can operate as dual function spin-photodetector, under zero external biases at room temperature. It can function as an optical spin-valve with magnetoresistance of greater than 60% and responsivity as high as 25.12 A/mW, when irradiated by an un-polarized light of energy ∼3.03 eV. Under a circularly polarized illumination, this optical spin-valve can also operate as a light helicity detector. The calculated magnetoresistances for right and left circularly polarized lights are both greater than 60%.

• OSTI ID: 22310891
• Journal Information: Applied Physics Letters, Vol. 105, Issue 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ASYMMETRY
COBALT
COPPER
EV RANGE
GOLD
GRAPHENE
HELICITY
ILLUMINANCE
IRRADIATION
MAGNETORESISTANCE
NANOSTRUCTURES
PHOTODETECTORS
P-TYPE CONDUCTORS
SPIN
TEMPERATURE RANGE 0273-0400 K
VISIBLE RADIATION