Journal
PHYSICAL REVIEW B
Volume 87, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.245121
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Funding
- DARPA QuEST program
- AFOSR [FA9550-10-1-0524]
- Samsung scholarship
- Microsoft Research Station
- NSF [1066293]
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We study origin of Rashba spin-orbit interaction at SrTiO3 surfaces and LaAlO3/SrTiO3 interfaces by considering the interplay between atomic spin-orbit coupling and inversion asymmetry at the surface or interface. We show that in a simple tight-binding model involving 3d t(2g) bands of Ti ions, the induced spin-orbit coupling in the d(xz) and d(yz) bands is cubic in momentum whereas the spin-orbit interaction in the d(xy) band has linear momentum dependence. We also find that the spin-orbit interaction in one-dimensional channels at LaAlO3/SrTiO3 interfaces is linear in momentum for all bands. We discuss implications of our results for transport experiments on SrTiO3 surfaces and LaAlO3/SrTiO3 interfaces. In particular, we analyze the effect of a given spin-orbit interaction term on magnetotransport of LaAlO3/SrTiO3 by calculating weak antilocalization corrections to the conductance and to universal conductance fluctuations.
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