Journal
PHYSICAL REVIEW B
Volume 87, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.161102
Keywords
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Funding
- SFB ViCoM (Austrian Science Fund project) [ID F4103-N13]
- European Research Council [FP7-ERC-227378]
- EU-Indian network MONAMI
- Austrian Ministry for Science and Research (BM.W_F)
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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 multiorbital effects: By far the biggest SOC effect is at the crossing point of the xy and yz (or zx) orbitals, and around the Gamma point a Rashba spin splitting with a cubic dependence on the wave vector (k) over right arrow is possible. DOI: 10.1103/PhysRevB.87.161102
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