Electrically controlled superconducting states at the heterointerface SrTiO${}_3$/LaAlO${}_3$

Abstract

We study the symmetry of Cooper pair in a two-dimensional Hubbard model with the Rashba-type spin-orbit interaction as a minimal model of electron gas generated at a heterointerface of SrTiO${}_3$/LaAlO${}_3$. Solving the Eliashberg equation based on the third-order perturbation theory, we find that the gap function consists of the mixing of the spin-singlet $d_{xy}$-wave component and the spin-triplet $(p_x\pm i{p}_y)$-wave one due to the broken inversion symmetry originating from the Rashba-type spin-orbit interaction. The ratio of the d-wave and the p-wave component continuously changes with the carrier concentration. We propose that the pairing symmetry is controlled by tuning the gate voltage.

4 pages, 4 figures; added references

References in corpus (7)

• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Topological spin-current in non-centrosymmetric superconductors
• Electron Correlation and Pairing States in Superconductors without Inversion Symmetry
• Surface bound states and spin currents in non-centrosymmetric superconductors
• Superconductivity and Magnetism in Non-centrosymmetric System: Application to CePt_3Si
• Enhanced triplet superconductivity in noncentrosymmetric systems
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• Anomalous Andreev bound state in non-centrosymmetric superconductors
• Surface density of states and topological edge states in non-centrosymmetric superconductors
• Topological superconductivity and unconventional pairing in oxide interfaces
• Order-Disorder Ferroelectric Transition of Strained SrTiO3
• Proximity effect with noncentrosymmetric superconductors
• Inter-orbital topological superconductivity in spin-orbit coupled superconductors with inversion symmetry breaking
• In-gap features in superconducting LaAlO${}_3$-SrTiO${}_3$ interfaces observed by tunneling spectroscopy
• Multi-Orbital Superconductivity in SrTiO3 /LaAlO3 Interface and SrTiO3 Surface
• Magnetoelectric Andreev effect due to proximity-induced non-unitary triplet superconductivity in helical metals
• Random Spin-orbit Coupling in Spin Triplet Superconductors: Stacking Faults in Sr_2RuO_4 and CePt_3Si
• Josephson Effect in Noncentrosymmetric Superconductor Junctions
• Competing superconducting phases in interacting two-dimensional electron gas with strong Rashba spin-orbit coupling
• Local electronic structures on the superconducting interface $LaAl{O}_3/SrTi{O}_3$
• Stability of flat zero-energy states at the dirty surface of a nodal superconductor
• Spin-Orbital Hallmarks of Unconventional Superconductors Without Inversion Symmetry
• Superconducting pairing symmetry on the extended Hubbard model in the presence of the Rashba-type spin-orbit coupling
• Electron Correlation Effects in Non-Centrosymmetric Metals in the Weak Coupling Regime
• The Hubbard model with spin orbit coupling: a lattice gauge theory approach
• Multi-orbital Fulde-Ferrell-Larkin-Ovchinnikov State in SrTiO_3 Heterostructures
• Delocalization of charge and current in a chiral quasiparticle wave-packet