Scanning tunneling microscopy of the π magnetism of a single carbon vacancy in graphene

Yu Zhang, Si Yu Li, Huaqing Huang, Wen Tian Li, Jia Bin Qiao, Wen Xiao Wang, Long Jing Yin, Ke Ke Bai, Wenhui Duan, Lin He*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

127 引用 (Scopus)

摘要

Pristine graphene is strongly diamagnetic. However, graphene with single carbon atom defects could exhibit paramagnetism. Theoretically, the π magnetism induced by the monovacancy in graphene is characteristic of two spin-split density-of-states (DOS) peaks close to the Dirac point. Since its prediction, many experiments have attempted to study this π magnetism in graphene, whereas only a notable resonance peak has been observed around the atomic defects, leaving the π magnetism experimentally elusive. Here, we report direct experimental evidence of π magnetism by using a scanning tunneling microscope. We demonstrate that the localized state of the atomic defects is split into two DOS peaks with energy separations of several tens of meV. Strong magnetic fields further increase the energy separations of the two spin-polarized peaks and lead to a Zeeman-like splitting. Unexpectedly, the effective g factor around the atomic defect is measured to be about 40, which is about 20 times larger than the g factor for electron spins.

源语言英语
文章编号166801
期刊Physical Review Letters
117
16
DOI
出版状态已出版 - 10 10月 2016
已对外发布

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