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The strongly correlated two-dimensional electron liquid withinSmTiO$_3$/SrTiO$_3$/SmTiO$_3$ quantum well structures exhibits a pseudogapphase when the quantum well width is sufficiently narrow. Using low-temperaturetransport and optical experiments that drive the quantum-well system out ofequilibrium, we find evidence of mobile, long-lived, negatively-chargedquasiparticles, consistent with the idea that the pseudogap phase arises fromstrongly bound electron pairs.

Breaking electron pairs in the pseudogap regime of SmTiO$_3$/SrTiO$_3$/SmTiO$_3$ quantum wells