Gas Doping on the Topological Insulator Bi2Se3 Surface

被引：30
|
作者：
Koleini, Mohammad [1 ,2 ]
Frauenheim, Thomas [1 ]
Yan, Binghai [1 ]
机构：
[1] Univ Bremen, Bremen Ctr Computat Mat Sci, D-28359 Bremen, Germany
[2] Univ Bremen, Hybrid Mat Interfaces Grp, Fac Prod Engn, D-28359 Bremen, Germany
来源：
PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 01期
关键词：
SINGLE DIRAC CONE; ELECTRON-EMISSION; OXYGEN; CHEMISORPTION; PHOTON;
D O I：
10.1103/PhysRevLett.110.016403
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Gas molecule doping on the topological insulator Bi2Se3 surface with existing Se vacancies is investigated using first-principles calculations. Consistent with experiments, NO2 and O-2 are found to occupy the Se vacancy sites, remove vacancy-doped electrons, and restore the band structure of a perfect surface. In contrast, NO and H-2 do not favor passivation of such vacancies. Interestingly we have revealed a NO2 dissociation process that can well explain the speculative introduced "photon-doping" effect reported by recent experiments. Experimental strategies to validate this mechanism are presented. The choice and the effect of different passivators are discussed. This step paves the way for the usage of such materials in device applications utilizing robust topological surface states. DOI: 10.1103/PhysRevLett.110.016403
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页数：5
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