Coverage-dependent magnetic and electronic properties of graphene with Co adatoms

Min Gao and Jun Hu
Additional contact information
Min Gao: School of Physical Science and Technology, Soochow University, Suzhou 215006, P. R. China†Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006, P. R. China
Jun Hu: School of Physical Science and Technology, Soochow University, Suzhou 215006, P. R. China†Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006, P. R. China‡School of Physical Science and Technology, Ningbo University, Ningbo 315211, P. R. China

International Journal of Modern Physics C (IJMPC), 2021, vol. 32, issue 12, 1-11

Abstract: Decorating two-dimensional (2D) materials with transition-metal adatoms is an effective way to bring about new physical properties that are intriguing for applications in electronics and spintronics devices. Here, we systematically studied the coverage-dependent magnetic and electronic properties of graphene decorated by Co adatoms, based on first-principles calculations. We found that if the Co coverage is larger than 1/3ML, the Co atoms will aggregate to form a Co monolayer and then a van der Waals bilayer system between the Co monolayer and graphene forms. When the Co coverage is ≤1∕3ML, the Co adatom is spin-polarized with spin moment varying from 1.1 to 1.4μB. The dxz∕yz and dxy∕x2−y2 orbitals of Co hybridize significantly with the π bands of graphene, which generates a series of new bands in the energy range from −2eV to 1eV with respect to the Dirac point of graphene. In most cases, the new bands near the Fermi level lead to topological states characterized by the quantum anomalous Hall effect.

Keywords: Graphene; adatom; coverage-dependent; band structure; topological state (search for similar items in EconPapers)
Date: 2021
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.worldscientific.com/doi/abs/10.1142/S0129183121501655
Access to full text is restricted to subscribers

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wsi:ijmpcx:v:32:y:2021:i:12:n:s0129183121501655

Ordering information: This journal article can be ordered from

DOI: 10.1142/S0129183121501655

Access Statistics for this article

International Journal of Modern Physics C (IJMPC) is currently edited by H. J. Herrmann

More articles in International Journal of Modern Physics C (IJMPC) from World Scientific Publishing Co. Pte. Ltd.
Bibliographic data for series maintained by Tai Tone Lim ().