Superconducting dome in the LaAlO3/SrTiO3 interfaces as a direct effect of the extended s-wave symmetry of the gap
Abstract
The two-dimensional electron gas (2DEG) at the LaAlO3/SrTiO3 interface exhibits gate tunable superconductivity with a domelike shape of TC as a function of electron concentration. Here, we propose that the experimentally observed behavior can be explained as a direct effect of the dominant extended s-wave symmetry of the superconducting gap. Our results agree very well with the experimental data. As shown, neither the correlation effects nor the spin-orbit coupling influence significantly the physical picture of the paired state steaming out from our analysis.
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