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O: Fachverband Oberflächenphysik

O 55: Electronic Structure and Spin-Orbit Interaction II

O 55.4: Talk

Wednesday, March 13, 2013, 16:45–17:00, H42

Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces — •Zhicheng Zhong — Institute of Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria

The theoretical understanding of the spin-orbit coupling (SOC) effects at LaAlO₃/SrTiO₃ interfaces and SrTiO₃ surfaces is still in its infancy. We perform first-principles density-functional-theory calculations and derive from these a simple tight-binding Hamiltonian, through a Wannier function projection and group theoretical analysis. We find striking differences to the standard Rashba theory for spin-orbit coupling in semiconductor heterostructures due to multi-orbital effects: by far the biggest SOC effect is at the crossing point of the xy and yz (or zx) orbitals; and around the Γ point a Rashba spin splitting with a cubic dependence on the wave vector k^→ is possible.