Double Rashba quantum dots ring as a spin filter

作者：Chi Feng^*; Yuan Xiqiu; Zheng Jun

来源：Nanoscale Research Letters, 2008, 3(9): 343-347.

DOI：10.1007/s11671-008-9163-z

• quantum dots
• spin filter
• Rashba spin-orbit interaction
• spin-dependent inter-dot coupling

We theoretically propose a double quantum dots (QDs) ring to filter the electron spin that works due to the Rashba spin-orbit interaction (RSOI) existing inside the QDs, the spin-dependent inter-dot tunneling coupling and the magnetic flux penetrating through the ring. By varying the RSOI-induced phase factor, the magnetic flux and the strength of the spin-dependent inter-dot tunneling coupling, which arises from a constant magnetic field applied on the tunneling junction between the QDs, a 100% spin-polarized conductance can be obtained. We show that both the spin orientations and the magnitude of it can be controlled by adjusting the above-mentioned parameters. The spin filtering effect is robust even in the presence of strong intra-dot Coulomb interactions and arbitrary dot-lead coupling configurations.

• 出版日期2008-9
• 单位渤海大学