Wei Chen, Peter Horsch, Dirk Manske
We study spin Josephson effect in the presence of external magnetic and electric field. The magnetic field can be used to maintain spin supercurrent between two antiferromagnetically coupled atomic spins, or to overcome the dipole-dipole interaction in a junction made by ferromagnetic metal. The Josephson spin current couples to electric field via spin-orbit coupling or Aharonov-Casher effect, which implies a $\varphi$-junction that can be controlled by electric field, and quantization of electric flux defined by $\Phi_{E}=EL$, where $L$ is the trajectory that electric field $E$ is applied. This quantization also manifests itself in spintronic devices such as the current-voltage characteristics of spin-FET, and the persistent spin current due to Aharonov-Casher effect in a ring.
View original:
http://arxiv.org/abs/1208.4274
No comments:
Post a Comment