刊名:The European Physical Journal B - Condensed Matter
出版年:2014
出版时间:January 2014
年:2014
卷:87
期:1
全文大小:337 KB
作者单位:R. Vali (1) H.F. Khouzestani (1)
1. School of Physics, Damghan University, P.O.Box 36715/364, Damghan, Islamic Republic of Iran
ISSN:1434-6036
文摘
We investigate theoretically the nonlocal transport properties in a ferromagnet/insulator/superconductor/insulator/ferromagnet (F/I/SC/I/F) junction with perpendicular magnetization formed on a topological insulator. The nonlocal conductance through the junction depends strongly on whether the perpendicular magnetizations of the two ferromagnets are in a parallel or an antiparallel alignment. This stems from the fact that on the surface of three dimensional topological insulator the exchange field acts as vector potential and from spin-momentum locking property of the topological insulator surface states. It is found that the nonlocal conductance as a function of barrier strength of the I regions exhibits a quantum switch on-off property.