中国物理B ›› 2015, Vol. 24 ›› Issue (3): 30303-030303.doi: 10.1088/1674-1056/24/3/030303
唐翰昭a, 翟利学a, 沈曼a b, 刘建军a c
Tang Han-Zhao (唐翰昭)a, Zhai Li-Xue (翟利学)a, Shen Man (沈曼)a b, Liu Jian-Jun (刘建军)a c
摘要:
We propose a theoretical method to investigate the effect of the Dresselhaus spin-orbit coupling (DSOC) on the spin transport properties of a regular polygonal quantum ring with an arbitrary number of segments. We find that the DSOC can break the time reversal symmetry of the spin conductance in a polygonal ring and that this property can be used to reverse the spin direction of electrons in the polygon with the result that a pure spin up or pure spin down conductance can be obtained by exchanging the source and the drain. When the DSOC is considered in a polygonal ring with Rashba spin-orbit coupling (RSOC) with symmetric attachment of the leads, the total conductance is independent of the number of segments when both of the two types of spin-orbit coupling (SOC) have the same value. However, the interaction of the two types of SOC results in an anisotropic and shape-dependent conductance in a polygonal ring with asymmetric attachment of the leads. The method we proposed to solve for the spin conductance of a polygon can be generalized to the circular model.
中图分类号: (Scattering theory)