Valley-polarized pumping current in zigzag graphene nanoribbons with different spatial symmetries Project supported by the National Natural Science Foundation of China (Grant Nos. 11704190, 11874221, and 11504240) and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20171030). |
(color online) Valley-polarized pumping current of symmetric ZGNRs as a function of the dephasing strength Γd with a static potential V0 = 0.2 V and a pumping potential Vp = 50 mV at Ef = −0.076 for different spatial symmetries. The phase difference is set to be π/2. |