Journal
CARBON
Volume 175, Issue -, Pages 87-92Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.12.076
Keywords
Defective graphene; Helium ion irradiation; Anderson localization; Negative magnetoresistance; Variable range hopping
Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [19K15385]
- NIMS Nanofabrication Platform in Nanotechnology Platform Project, the World Premier International Research Center Initiative on Materials Nanoarchitectonics, sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Murata Science Foundation
- Grants-in-Aid for Scientific Research [19K15385] Funding Source: KAKEN
Ask authors/readers for more resources
The study focuses on Anderson localization in Dirac materials and the strong and weak localization phenomena in specific graphene. Negative magnetoresistance was achieved through helium ion irradiation, and for the first time, negative magnetoresistance in graphene devices was observed at room temperature.
Anderson localization (AL), a major topic in condensed matter physics, has been extensively studied. Since the discovery of graphene, its unique AL in Dirac materials, particularly weak localization (WL), has been studied intensively. Strong localization (SL) has also been investigated in graphene with intentionally introduced defects. The precise control of spacing/strength of defects using conventional methods is challenging; thus, He-ion-irradiation is a promising technology. However, magnetotransport, a sensitive tool to probe AL, has not yet been studied for He-ion-irradiated graphene. Herein, we systematically investigate the magnetotransport of He-ion-irradiated graphene. We observe negative magnetoresistance (MR) due to SL-dominated hopping transport. By systematically tuning the device parameters, negative MR at room temperature is first revealed for graphene field-effect transistor devices. Our study reveals carrier localization via searching in the multidimensional parameter space of Dirac materials, contributing to the development of fundamental AL physics and magnetoelectronic device applications. (C) 2020 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available