TY - JOUR
T1 - Electric field controlled spin- and valley-polarized edge states in silicene with extrinsic Rashba effect
AU - Yu, Zhiming
AU - Pan, Hui
AU - Yao, Yugui
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/10/14
Y1 - 2015/10/14
N2 - In the presence of extrinsic Rashba spin-orbit coupling, we find that silicene can host a quantum anomalous Hall state with spin- and valley-polarized edge states, which can be effectively controlled by the exchange field and electric field. In this state, a pair of nontrivial edge states reside in one specific valley and have a strong but opposite spin polarization. A distinctive feature of this state is that both of the spin and valley indexes of the edge states can be switched by reversing the electric field. We also present a microscopic mechanism for the origin of this state. Our findings provide an efficient way to control the topologically protected spin- and valley-polarized edge states, which is crucial for spintronics and valleytronics.
AB - In the presence of extrinsic Rashba spin-orbit coupling, we find that silicene can host a quantum anomalous Hall state with spin- and valley-polarized edge states, which can be effectively controlled by the exchange field and electric field. In this state, a pair of nontrivial edge states reside in one specific valley and have a strong but opposite spin polarization. A distinctive feature of this state is that both of the spin and valley indexes of the edge states can be switched by reversing the electric field. We also present a microscopic mechanism for the origin of this state. Our findings provide an efficient way to control the topologically protected spin- and valley-polarized edge states, which is crucial for spintronics and valleytronics.
UR - http://www.scopus.com/inward/record.url?scp=84944810695&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.92.155419
DO - 10.1103/PhysRevB.92.155419
M3 - Article
AN - SCOPUS:84944810695
SN - 1098-0121
VL - 92
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 15
M1 - 155419
ER -