Spin dependent disorder in a junction device with spin orbit couplings

27th IUPAP Conference on Computational Physics

物理学;计算机科学

Ganguly, Sudin^1 ; Basu, Saurabh^1

Indian Institute of Technology Guwahati, Assam

781039, India^1

关键词: Disorder strength;    Green's function approaches;    Junction devices;    Longitudinal conductances;    Multiprobes;    Random disorders;    Spin-hall conductance;    Spin-orbit couplings;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/759/1/012028/pdf
DOI  :  10.1088/1742-6596/759/1/012028

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Using the multi-probe Landauer-BUttiker formula and Green's function approach, we calculate the longitudinal conductance (LC) and spin Hall conductance (SHC) numerically in a two-dimensional junction system with the Rashba and Dresselhaus spin orbit coupling (SOC) and spin dependent disorder (SDD) in presence of both random onsite and hopping disorder strengths. It has been found that when the strengths of the RSOC and DSOC are same, the SHC vanishes. Further in presence of random onsite or hopping disorder, the SHC is still zero when the strengths of the two types of SOC, that is Rashba and Dressselhaus are the same. This indicates that the cancellation of SHC is robust even in the presence of random disorder. Only with the inclusion of SDD (onsite or hopping), a non-zero SHC is found and it increases as the strength of SDD increases. The physical implication of the existence of a non-zero SHC has been explored in this work. Finally, we have compared the effect of onsite SDD and hopping SDD on both longitudinal and spin Hall conductances.