Evidence for formation of multi-quantum dots in hydrogenated graphene.
We report the experimental evidence for the formation of multi-quantum dots in a hydrogenated single-layer graphene flake. The existence of multi-quantum dots is supported by the low-temperature measurements on a field effect transistor structure device. The resulting Coulomb blockade diamonds shown in the color scale plot together with the number of Coulomb peaks exhibit the characteristics of the so-called 'stochastic Coulomb blockade'. A possible explanation for the formation of the multi-quantum dots, which is not observed in pristine graphene to date, was attributed to the impurities and defects unintentionally decorated on a single-layer graphene flake which was not treated with the thermal annealing process. Graphene multi-quantum dots developed around impurities and defect sites during the hydrogen plasma exposure process.
Cavendish Laboratory, University of Cambridge, J, J, Thomson Avenue, Cambridge, CB3 0HE, UK. cgs4@cam.ac.uk.
Chiashain
C
Chuang
Reuben K
RK
Puddy
Malcolm R
MR
Connolly
Shun-Tsung
ST
Lo
Huang-De
HD
Lin
Tse-Ming
TM
Chen
Charles G
CG
Smith
Chi-Te
CT
Liang