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2018 Volume 27 Issue 12
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Zhizhou Yu, Fuming Xu. 2018: Valley-polarized pumping current in zigzag graphene nanoribbons with different spatial symmetries, Chinese Physics B, 27(12): 124-129. doi: 10.1088/1674-1056/27/12/127203
Citation: Zhizhou Yu, Fuming Xu. 2018: Valley-polarized pumping current in zigzag graphene nanoribbons with different spatial symmetries, Chinese Physics B, 27(12): 124-129. doi: 10.1088/1674-1056/27/12/127203
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Valley-polarized pumping current in zigzag graphene nanoribbons with different spatial symmetries

  • Center for Quantum Transport and Thermal Energy Science, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China

  • College of Physics and Energy, Shenzhen University, Shenzhen 518060, China

  • Available Online: 01/01/2018
  • Fund Project: the National Natural Science Foundation of China(Grant . 11704190, 11874221, and 11504240)%the Natural Science Foundation of Jiangsu Province, China(Grant BK20171030)
  • We numerically investigate the valley-polarized current in symmetric and asymmetric zigzag graphene nanorib-bons (ZGNRs) by the adiabatic pump, and the effect of spatial symmetry is considered by introducing different pump-ing regions. It is found that pumping potentials with the symmetry Vp(x,y)=Vp(?x,y) can generate the largest valley-polarized current. The valley-polarized currents IL13 with the pumping potential symmetry Vp(x,y)=Vp(x,?y) and IL14 with Vp(x,y)=Vp(?x,?y) of symmetric ZGNRs are much smaller than those of asymmetric ZGNRs. We also find IL13 and IL14 of symmetric ZGNRs decrease and increase with the increasing pumping amplitude, respectively. Moreover, the dephasing effect from the electron–phonon coupling within the Buttiker dephasing scheme is introduced. The valley-polarized current of the symmetric ZGNRs with Vp(x,y)=Vp(x,?y) increases with the increase of the dephasing strength while that with Vp(x,y)=Vp(?x,?y) decreases as the dephasing strength increases.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Valley-polarized pumping current in zigzag graphene nanoribbons with different spatial symmetries

  • Available Online: 01/01/2018

Abstract: We numerically investigate the valley-polarized current in symmetric and asymmetric zigzag graphene nanorib-bons (ZGNRs) by the adiabatic pump, and the effect of spatial symmetry is considered by introducing different pump-ing regions. It is found that pumping potentials with the symmetry Vp(x,y)=Vp(?x,y) can generate the largest valley-polarized current. The valley-polarized currents IL13 with the pumping potential symmetry Vp(x,y)=Vp(x,?y) and IL14 with Vp(x,y)=Vp(?x,?y) of symmetric ZGNRs are much smaller than those of asymmetric ZGNRs. We also find IL13 and IL14 of symmetric ZGNRs decrease and increase with the increasing pumping amplitude, respectively. Moreover, the dephasing effect from the electron–phonon coupling within the Buttiker dephasing scheme is introduced. The valley-polarized current of the symmetric ZGNRs with Vp(x,y)=Vp(x,?y) increases with the increase of the dephasing strength while that with Vp(x,y)=Vp(?x,?y) decreases as the dephasing strength increases.

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