Aharonov-Casher effect in Bi$_{\rm 2}$Se$_{\rm 3}$ square-ring   interferometers
  Electrical control of spin dynamics in Bi$_{\rm 2}$Se$_{\rm 3}$ was investigated in ring-type interferometers. Aharonov-Bohm and Altshuler-Aronov-Spivak resistance oscillations against magnetic field, and Aharorov-Casher resistance oscillations against gate voltage were observed in the presence of a Berry phase of $\pi$. A very large tunability of spin precession angle by gate voltage has been obtained, indicating that Bi$_{\rm 2}$Se$_{\rm 3}$-related materials with strong spin-orbit coupling are promising candidates for constructing novel spintronic devices. 
Fanming Qu, Fan Yang, Jun Chen, Jie Shen, Yue Ding, Jiangbo Lu,   Yuanjun Song, Huaixin Yang, Guangtong Liu, Jie Fan, Yongqi...
cond-mat.mes-hall