Spin Hall conductance in a Y-shaped junction device in presence of tunable spin-orbit coupling

摘要

We study spin Hall effect in a three terminal Y-shaped device in presence oftunable spin-orbit (SO) interactions via Landauer-B\"{u}ttiker formalism. Wehave evolved a fabrication technique for creating different angular separationbetween the two arms of the Y-shaped device so as to investigate the effect ofangular width on the spin Hall conductance (SHC). A smaller angular separationyields a larger conductance. Also arbitrary orientation of the spinquantization axes yields interesting three dimensional contour maps for the SHCcorresponding to different angular separation of the Y-shaped device. Theresults explicitly show breaking of the spin rotational symmetry. Further asystematic study is carried out to compare and contrast between the differentSO terms, such as Rashba and Dresselhaus SO interactions and the interplay ofthe angular separation therein.