Detection of resonant impurities in graphene by quantum capacitance measurement

Lin Wang, Xiaolong Chen, Wei Zhu, Yang Wang, Chao Zhu, Zefei Wu, Yu Han, Mingwei Zhang, Wei Li, Yuheng He, and Ning Wang
Phys. Rev. B 89, 075410 – Published 10 February 2014
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Abstract

We investigated Ag-adatom-induced resonant impurities of graphene by quantum capacitance measurement. Different from charged impurities and other conventional resonant impurities, Ag atoms form very weak covalent bonds with graphene. The Ag-adatom-induced resonant peak as measured by quantum capacitance grows more intense at cryogenic temperatures, at higher impurity concentrations, and in stronger magnetic fields, in accordance with our theoretical calculations. The appearance of resonant states and the split of the zeroth Landau level for Ag-adsorbed graphene are manifestations of the formation of a flat impurity band near the Dirac point.

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  • Received 7 January 2014
  • Revised 22 January 2014

DOI:https://doi.org/10.1103/PhysRevB.89.075410

©2014 American Physical Society

Authors & Affiliations

Lin Wang1,*, Xiaolong Chen1,*, Wei Zhu2, Yang Wang1, Chao Zhu1, Zefei Wu1, Yu Han1, Mingwei Zhang1, Wei Li1, Yuheng He1, and Ning Wang1,*

  • 1Department of Physics and the William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Hong Kong, China
  • 2Department of Physics and Astronomy, California State University, Northridge, California 91330, USA

  • *These authors contributed equally to this work.
  • Corresponding author: phwang@ust.hk

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Issue

Vol. 89, Iss. 7 — 15 February 2014

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