Controllable Valley Polarization Using Silicene Double Line Defects Due to Rashba Spin-Orbit Coupling
Controllable Valley Polarization Using Silicene Double Line Defects Due to Rashba Spin-Orbit Coupling
复制标题
利用 Rashba 自旋轨道耦合产生的硅烯双线缺陷进行可控谷偏振
DOI:
10.1186/s11671-019-3196-3
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发表时间:
2019-11
影响因子:
--
通讯作者:
Jing Liu
中科院分区:
文献类型:
--
作者:
Ren Chongdan;Benhu Zhou;Shaoyin Zhang;Weitao Lu;Yunfang Li;Hongyu Tian;Jing Liu
We theoretically investigate the valley polarization in silicene with two parallel line defects due to Rashba spin-orbit coupling (RSOC). It is found that as long as RSOC exceeds the intrinsic spin-orbit coupling (SOC), the transmission coefficients of the two valleys oscillate with the same periodicity and intensity, which consists of wide transmission peaks and zero-transmission plateaus. However, in the presence of a perpendicular electric field, the oscillation periodicity of the first valley increases, whereas that of the second valley shortens, generating the corresponding wide peak-zero plateau regions, where perfect valley polarization can be achieved. Moreover, the valley polarizability can be changed from 1 to −1 by controlling the strength of the electric field. Our findings establish a different route for generating valley-polarized current by purely electrical means and open the door for interesting applications of semiconductor valleytronics.
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