Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2014 Jan 24;112(3):037001. doi: 10.1103/PhysRevLett.112.037001. Epub 2014 Jan 23.
In this work, we find that Majorana fermions induce selective equal spin Andreev reflections (SESARs), in which incoming electrons with certain spin polarization in the lead are reflected as counterpropagating holes with the same spin. The spin polarization direction of the electrons of this Andreev reflected channel is selected by the Majorana fermions. Moreover, electrons with opposite spin polarization are always reflected as electrons with unchanged spin. As a result, the charge current in the lead is spin polarized. Therefore, a topological superconductor which supports Majorana fermions can be used as a novel device to create fully spin-polarized currents in paramagnetic leads. We point out that SESARs can also be used to detect Majorana fermions in topological superconductors.
在这项工作中，我们发现马约拉纳费米子诱导了选择性等自旋安德烈夫反射（SESAR），其中具有特定自旋极化的进入 lead 的电子被反射为具有相同自旋的反向传播空穴。这个安德烈夫反射通道中的电子的自旋极化方向是由马约拉纳费米子选择的。此外，具有相反自旋极化的电子总是被反射为自旋不变的电子。因此，lead 中的电荷电流是自旋极化的。因此，支持马约拉纳费米子的拓扑超导体可用作在顺磁 lead 中产生完全自旋极化电流的新型器件。我们指出，SESAR 也可用于探测拓扑超导体中的马约拉纳费米子。
