In this study, quantum Hall effect-like plateaus, exhibiting the behavior of single- and multi-graphene, are observed in ZYA-grade highly oriented pyrolytic graphite (HOPG). Massless Dirac carriers and massive normal carriers of the HOPG are distinguished from the analysis of Shubnikov-de Haas and de Haas van Alphen oscillations. The quantum Hall effect-like plateaus are diminished after proton-irradiation owing to increasing interlayer interaction along the c-axis that causes the change of two-dimensional massless carriers of the HOPG to three-dimensional massive carriers. Moreover, tight-binding calculations exhibit similar diminishing plateaus of the Hall conductivity of HOPG as the interlayer interaction increases. This observation of dimensional crossover of the Hall conductivity demonstrates that proton-irradiation would be a useful tool to control quantum transport in HOPG through manipulating its interlayer interaction.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (Project No. 2019R1A2C1002076 ) and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( 2016R1A6A1A03012877 ). Also, this work was supported by the Dongguk University Research Fund of 2020. The measurements at the High Magnetic Field Laboratory are gratefully acknowledged.
© 2021 Elsevier Ltd
- De Haas Van Alphen effect
- Quantum Hall effect
- Shubnikov-de Haas oscillation
ASJC Scopus subject areas
- General Chemistry
- General Materials Science