Abstract

We study spin and charge accumulation in two-dimensional electron gas (2DEG) with spin-orbit Rashba interactions. The Landauer–Keldysh formalism is employed to numerically compute accumulations in a 2DEG finite square sample with and without an embedded spin-independent hard-wall impurity. Cases with two and four attached ideal leads are considered. We find that in the two directions perpendicular to the Rashba field the impurity induces, respectively, a dipole and a quadrupole. In the direction parallel to the Rashba field the spin accumulation is determined purely by the imposed boundary conditions.

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