Mapping spin-orbit splitting in strained (In,Ga)As epilayers

作者：Norman B M^*; Trowbridge C J; Stephens J; Gossard A C; Awschalom D D; Sih V

来源：Physical Review B, 2010, 82(8): 081304.

DOI：10.1103/PhysRevB.82.081304

Time-resolved and spatially resolved Faraday rotation spectroscopy is used to measure the magnitude and direction of the momentum-dependent spin splitting in strained InGaAs epilayers. The epilayers are coherently strained and therefore designed to reduce inhomogeneous effects related to strain relaxation. Measurements of momentum-dependent spin splitting as a function of electron spin drift velocity along [100], [010], [110], and [1 (1) over bar0] directions enable separation of isotropic and anisotropic effective magnetic fields that arise from uniaxial and biaxial strain along < 110 >. We find that the anisotropic and isotropic strain-induced effective magnetic fields are comparable in magnitude, contrary to previous predictions.

• 出版日期2010-8-6