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We investigate the superconductivity in two-dimensional electron systemsformed in SrTiO3 nanostructures. Our the- oretical analysis is based on thethree-orbital model, which takes into account t2g orbitals of Ti ions. Becauseof the interfacial breaking of mirror symmetry, a Rashba-type antisymmetricspin-orbit coupling arises from the cooperation of intersite and interorbitalhybridyzation and atomic LS coupling. This model shows a characteristic spintexture and carrier density dependence of Rashba spin-orbit coupling throughthe orbital degree of freedom. Superconductivity is mainly caused by heavyquasiparticles consisting of dyz and dzx orbitals at high carrier densities. Wefind that the Rashba spin-orbit coupling stabilizes a quasi-one-dimensionalsuperconducting phase caused by one of the dyz or dzx orbitals at high magneticfields along interfaces. This quasi-one-dimensional superconducting phase isprotected against para- magnetic depairing effects by the Rashba spin-orbitcoupling and realizes a large upper critical field Hc2 beyond thePauli-Clogston-Chandrasekhar limit. This finding is consistent with anextraordinarily large upper critical field observed in SrTiO3 /LaAlO3interfaces and its carrier density dependence. The possible coexistence ofsuperconductivity and fer- romagnetism in SrTiO3 /LaAlO3 interfaces may also beattributed to this quasi-one-dimensional superconducting phase.

Multi-Orbital Superconductivity in SrTiO3 /LaAlO3 Interface and SrTiO3 Surface