We consider the consequences of spatially modulating a heterostructure’s Rashba or Dresselhaus coefficient within the plane. Periodic reversal of the asymmetry direction is found to induce bound states via “kinetic spin confinement,” an alternative to the potential and kinetic confinement mechanisms that have been discussed previously. In such a structure the spin identity of the energy levels varies as a function of position, even though both the band edge and effective mass remain unaltered. We point out that “spin dipoles” and enhanced equilibrium spin currents may be created in the vicinity of the interfaces between well and barrier.

• Received 1 June 2004

DOI:https://doi.org/10.1103/PhysRevB.70.205319