DOIONLINE 
DOIONLINE Publish In |
International Journal of Advances in Science, Engineering and Technology(IJASEAT)-IJASEAT |
 Journal Home Volume Issue |
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Issue |
Volume-5,Issue-1, Spl. Iss-2 ( Feb, 2017 ) | |||||||||
Paper Title |
A Zero-Bias Conductance Anomaly Due to Kondo Effect in Graphene Quantum Dots | |||||||||
Author Name |
Y. Kanai, M. Almokhtar, T. Ono, Y. Ohno, K. Maehashi, K. Inoue, K. Matsumoto | |||||||||
Affilition |
The Institute of Scientific and Industrial Research, Osaka Univ. Ibaraki, Osaka, Japan Physics Department, Assiut University, Assiut, Egypt Tokushima Univ., Shinkura-cho, Tokushima,Japan Tokyo University of Agriculture and Technology, Harumi-cho, Fuchu-shi, Tokyo, Japan | |||||||||
Pages |
27-29 | |||||||||
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. | |||||||||
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