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Chin. Phys. B, 2018, Vol. 27(5): 057801    DOI: 10.1088/1674-1056/27/5/057801

Spin-current pump in silicene

John Tombe Jada Marcellino1, Mei-Juan Wang(王美娟)1, Sa-Ke Wang(汪萨克)2, Jun Wang(汪军)1
1 Department of Physics, Southeast University, Nanjing 210096, China;
2 Department of Fundamental Courses, Jinling Institute of Technology, Nanjing 211169, China

We report a theoretical study of pumped spin currents in a silicene-based pump device, where two time-dependent staggered potentials are introduced through the perpendicular electric fields and a magnetic insulator is considered in between the two pumping potentials to magnetize the Dirac electrons. It is shown that giant spin currents can be generated in the pump device because the pumping can be optimal for each transport mode, the pumping current is quantized. By controlling the relevant parameters of the device, both pure spin currents and fully spin-polarized currents can be obtained. Our results may shed a new light on the generation of pumped spin currents in Dirac-electron systems.

Keywords:  spin currents      charge pump      quantization      silicene  
Received:  10 January 2018      Revised:  26 February 2018      Accepted manuscript online: 
PACS:  78.20.Jq (Electro-optical effects)  
  71.70.Fk (Strain-induced splitting)  
  72.80.Vp (Electronic transport in graphene)  

Project supported by the National Natural Science Foundation of China (Grant Nos.11274059,11574045,and 11704165).

Corresponding Authors:  Jun Wang     E-mail:

Cite this article: 

John Tombe Jada Marcellino, Mei-Juan Wang(王美娟), Sa-Ke Wang(汪萨克), Jun Wang(汪军) Spin-current pump in silicene 2018 Chin. Phys. B 27 057801

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