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Chin. Phys. B, 2016, Vol. 25(8): 087303    DOI: 10.1088/1674-1056/25/8/087303
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Impurity effect on surface states of Bi (111) ultrathin films

Kai Zhu(朱凯)1,2, Dai Tian(田岱)1,2, Lin Wu(伍琳)1,2, Jianli Xu(许建丽)1,2, Xiaofeng Jin(金晓峰)1,2
1 State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China;
2 Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China
Abstract  

The surface impurity effect on the surface-state conductivity and weak antilocalization (WAL) effect has been investigated in epitaxial Bi (111) films by magnetotransport measurements at low temperatures. The surface-state conductivity is significantly reduced by the surface impurities of Cu, Fe, and Co. The magnetotransport data demonstrate that the observed WAL is robust against deposition of nonmagnetic impurities, but it is quenched by the deposition of magnetic impurities which break the time reversal symmetry. Our results help to shed light on the effect of surface impurities on the electron and spin transport properties of a 2D surface electron systems.

Keywords:  bismuth      weak antilocalization      surface states  
Received:  26 May 2016      Revised:  31 May 2016      Accepted manuscript online: 
PACS:  73.25.+i (Surface conductivity and carrier phenomena)  
  71.30.+h (Metal-insulator transitions and other electronic transitions)  
  73.50.-h (Electronic transport phenomena in thin films)  
Fund: 

Project supported by the National Basic Research Program of China (Grants Nos. 2015CB921400 and 2011CB921802) and the National Natural Science Foundation of China (Grants Nos. 11374057, 11434003, and 11421404).

Corresponding Authors:  Xiaofeng Jin     E-mail:  xfjin@fudan.edu.cn

Cite this article: 

Kai Zhu(朱凯), Dai Tian(田岱), Lin Wu(伍琳), Jianli Xu(许建丽), Xiaofeng Jin(金晓峰) Impurity effect on surface states of Bi (111) ultrathin films 2016 Chin. Phys. B 25 087303

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