Paper Title :A Zero-Bias Conductance Anomaly Due to Kondo Effect in Graphene Quantum Dots
Author :Y. Kanai, M. Almokhtar, T. Ono, Y. Ohno, K. Maehashi, K. Inoue, K. Matsumoto
Article Citation :Y. Kanai ,M. Almokhtar ,T. Ono ,Y. Ohno ,K. Maehashi ,K. Inoue ,K. Matsumoto ,
(2017 ) " A Zero-Bias Conductance Anomaly Due to Kondo Effect in Graphene Quantum Dots " ,
International Journal of Advances in Science, Engineering and Technology(IJASEAT) ,
pp. 27-29,
Volume-5,Issue-1, Spl. Iss-2
Abstract : Graphene is suitable material for keeping electron spin states and expected for spintronics devices because of
weak spin-orbit interaction and weak nuclear spin interaction. From this reason, spin-correlation phenomena are investigated
in graphene. Kondo effect in quantum dot is forming spin singlet state between electrons in leads and a dot and one of the
spin correlation effects in quantum dots. Here, we will report Kondo effect in a graphene quantum dot. We fabricated
graphene quantum dots by electron-beam lithography and reactive-ion etching from chemical-vapor-deposition graphene.
We measured graphene quantum dots at T ~ 20 mK by a dilution refrigerator. We observed zero-bias anomaly at Coulomb
blockade in graphene quantum dots. As magnetic field increases, the zero-bias conductance was suppressed. These results
indicate that the zero bias anomaly comes from Kondo effect. We evaluated Kondo temperature ~ 4.8 K from the width of
zero-bias conductance.
Keywords: Graphene, Quantum dot, Kondo effect, Transport.
Type : Research paper
Published : Volume-5,Issue-1, Spl. Iss-2
DOIONLINE NO - IJASEAT-IRAJ-DOIONLINE-7173
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Published on 2017-05-08 |
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