Chin. Phys. Lett.  2018, Vol. 35 Issue (10): 107201    DOI: 10.1088/0256-307X/35/10/107201
Impurity Effects at Surfaces of a Photon-Dressed Bi$_2$Se$_3$ Thin Film
Qiu-Shi Wang1, Bin Zhang1, Wei-Zhu Yi1, Meng-Nan Chen2, Baigeng Wang1,3, R. Shen1,3**
1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
2School of Science, Hangzhou Dianzi University, Hangzhou 310018
3Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093
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Qiu-Shi Wang, Bin Zhang, Wei-Zhu Yi et al  2018 Chin. Phys. Lett. 35 107201
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Abstract We investigate the impurity effects on surfaces of a thin film topological insulator, applied by an off-resonant circular polarized light. It is found that the off-resonant driving induces a quantized total Hall conductivity, when the driving strength is larger than a critical value and the Fermi level lies in the band gap, indicating that our system is converted into the topological phase. We also find that with the increasing disorder strength, the Dirac masses of top and bottom surfaces are renormalized and then fixed to half of their initial values, respectively, which will shrink the widths of the half-integer plateau of anomalous Hall conductivities.
Received: 02 July 2018      Published: 15 September 2018
PACS:  72.80.Ng (Disordered solids)  
  73.23.-b (Electronic transport in mesoscopic systems)  
  73.43.-f (Quantum Hall effects)  
  03.65.Vf (Phases: geometric; dynamic or topological)  
Fund: Supported by the National Key R&D Program of China under Grant No 2017YFA0303203, and the National Natural Science Foundation of China under Grant Nos 11574217 and 11474149.
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Qiu-Shi Wang
Bin Zhang
Wei-Zhu Yi
Meng-Nan Chen
Baigeng Wang
R. Shen
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