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Electron gases at the surfaces of (001), (110), and (111) oriented SrTiO3(STO) have been created using Ar+-irradiation with fully metallic behavior andlow-temperature-mobility as large as 5500 cm2V-1s-1, 1300 cm2V-1s-1 and 8600cm2V-1s-1 for (001)-, (110)-, and (111)-surfaces, respectively. The in-planeanisotropic magnetoresistance (AMR) have been studied for the samples with thecurrent along different crystal axis directions to subtract the Lorentz Forceeffect. The AMR shows features which coincide with the fixed orientations tothe crystalline axes, with 4-fold, 2-fold and nearly-6-fold symmetries for(001)-, (110) and (111)-surfaces, respectively, independent of the currentdirections. These features are possibly caused by the polarization of spinorbit texture of the 2D Fermi surfaces. In addition, a 6-fold to 2-foldsymmetry breaking for (111)-surfaces is observed. Our results demonstrate theeffect of symmetry of two-dimensional electronic structure on the transportbehaviors for the electron gases at STO surfaces.

Anisotropic magnetotransport of electron gases at SrTiO3 (111) and (110) surfaces with high mobility