Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (8): 80501-080501.doi: 10.11889/j.0253-3219.2019.hjs.42.080501

• NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH • Previous Articles     Next Articles

Band engineering of graphene: manganese intercalation by alloying with germanium substrate

Fenwei CUI1,2,Xudong HU1,2,Hailong ZHU1,2,Benrui HUANG1,2,Ni MA1,2,Ang LI1,3()   

  1. 1. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Joint Laboratory for Quantum Electronics, School of Physical Science and Technology, Shanghai Tech University, Shanghai 201210, China
  • Received:2019-05-01 Revised:2019-05-09 Online:2019-08-10 Published:2019-08-26
  • Contact: Ang LI E-mail:angli@mail.sim.ac.cn
  • About author:CUI Fenwei, male, born in 1992, graduated from Xi’an Jiaotong University in 2014, focusing on materials science and engineering|CUI Fenwei, male, born in 1992, graduated from Xi’an Jiaotong University in 2014, focusing on materials science and engineering
  • Supported by:
    the Natural Science Foundation of Shanghai.(18ZR1447300)

Abstract: Background

It is essential to introduce a bandgap in graphene or its heterojunctions in the field of band engineering.

Purpose

This study aims to intercalate two-dimensional Mn-Ge alloy island between graphene and the Ge(110) substrate and modify the electronic state of graphene.

Methods

The atomic structure and low-energy electronic excitation were studied by scanning tunneling microscopy (STM).

Results

We found one-dimensional nanowires and two-dimensional planar islands in samples with different graphene coverage. Without graphene protection, two-dimensional alloy islands can grow into three-dimensional wedges. The intercalation of one-dimensional nanowires and two-dimensional planar islands opens an energy gaps of 400 meV and 200 meV respectively.

Conclusions

Mn is intercalated to the graphene/Ge(110) through the edge of the graphene island by alloying with germanium. The open energy gap provides a feasible method for engineering the band structure of graphene.

Key words: Graphene, Scanning tunneling microscopy/spectroscopy, Intercalation, Band engineering

CLC Number: 

  • TN304.9