Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (7): 2178.doi: 10.7503/cjcu20210135

• Article • Previous Articles     Next Articles

Surface and Size Effects of Nitrogen-vacancy Centers in Diamond Nanowires

HU Wei, LIU Xiaofeng, LI Zhenyu, YANG Jinlong()   

  1. Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China
  • Received:2021-03-01 Online:2021-07-10 Published:2021-05-20
  • Contact: YANG Jinlong E-mail:jlyang@ustc.edu.cn
  • Supported by:
    This paper is supported by the National Natural Science Foundation of China(21688102);the Pioneer Hundred Talents Program of Chinese Academy of Sciences(KJ2340000031);the National Key Research and Development Program of China(2016YFA0200604);the Program Anhui Initiative in Quantum Information Technologies, China(AHY090400);the Strategic Priority Research Program of Chinese Academy of Sciences(XDC01040100);the Fundamental Research Funds for the Central Universities, China(WK2340000091);the Research StartUp Grants(KY2340000094);the Academic Leading Talents Training Program(KY2340000103);from University of Science and Technology of China

Abstract:

To control the electronic structures and stability of nitrogen-vacancy(NV) center in diamond is crucial for their practical applications. The surface and size effects on the structural, electronic, magnetic properties and stability of NV centers doped in diamond nanowires(DNs) were systematically investigated via large-scale spin-polarized density functional theory calculations. We theoretically design several types of DNs with different surface modifications(clean, hydrogenated and fluorinated) and the diameter sizes up to hundreds of atoms. It demonstrated that the electronic structures of neutral NV0 and negative NV- centers are not affected by semiconducting surface modifications and diameter sizes of DNs, but the stability are sensitive to these two effects. Furthermore, we find that the surface modifications induce a size-independent and long-range effect on the stability of the NV-center doped in DNs due to the cylindrical surface electric dipole layer in DNs. In particular, the NV- center doped in DNs can be stabilized for n-type fluorinated diamond surfaces, while NV0 is relatively more stable for p-type hydrogenated surfaces. Therefore, surface modification provides a precise and effective way to control the electronic structures and stability of charged defects in semiconductors.

Key words: Nitrogen-vacancy center in diamond, Surface and size effect, Density functional theory

CLC Number: 

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