Apel V M, Orellana P A, Pacheco M
Departamento de Física, Universidad Católica del Norte, Casilla 1280, Antofagasta, Chile.
Nanotechnology. 2008 Sep 3;19(35):355202. doi: 10.1088/0957-4484/19/35/355202. Epub 2008 Jul 17.
The electronic transport in a system of two quantum rings side-coupled to a quantum wire is studied via a single-band tunneling tight-binding Hamiltonian. We derived analytical expressions for the conductance and spin polarization when the rings are threaded by magnetic fluxes with Rashba spin-orbit interaction. We show that by using the Fano and Dicke effects this system can be used as an efficient spin filter even for small spin-orbit interaction and small values of magnetic fluxes. We compare the spin-dependent polarization of this design and the polarization obtained with one ring side-coupled to a quantum ring. As a main result, we find better spin polarization capabilities as compared to the one-ring design.
通过单带隧穿紧束缚哈密顿量研究了与量子线侧耦合的两个量子环系统中的电子输运。当环被具有Rashba自旋轨道相互作用的磁通量穿过时，我们推导了电导和自旋极化的解析表达式。我们表明，通过利用法诺效应和狄克效应，即使对于小的自旋轨道相互作用和小的磁通量值，该系统也可以用作高效的自旋滤波器。我们比较了这种设计的自旋相关极化与一个环侧耦合到量子环所获得的极化。作为主要结果，我们发现与单环设计相比，这种设计具有更好的自旋极化能力。
