Universal Rashba Spin Precession of Two-Dimensional Electrons and Holes
  We study spin precession due to Rashba spin splitting of electrons and holes in semiconductor quantum wells. Based on a simple analytical expression that we derive for the current modulation in a broad class of experimental situations of ferromagnet/nonmagnetic semiconductor/ferromagnet hybrid structures, we conclude that the Datta-Das spin transistor (i) is feasible with holes and (ii) its functionality is not affected by integration over injection angles. The current modulation shows a universal oscillation period, irrespective of the different forms of the Rashba Hamiltonian for electrons and holes. The analytic formulas approximate extremely well exact numerical calculations of a more elaborate Kohn--Luttinger model. 
Marco G. Pala (1), Michele Governale (2), J\"urgen K\"onig (2), and   Ulrich Z\"ulicke (2) ((1) U. Pisa, (2) U. Karlsruhe)