Breaking electron pairs in the pseudogap regime of SmTiO3/SrTiO3/SmTiO3 quantum wells
Abstract
The strongly correlated two-dimensional electron liquid within SmTiO3/SrTiO3/SmTiO3 quantum well structures exhibits a pseudogap phase when the quantum well width is sufficiently narrow. Using low-temperature transport and optical experiments that drive the quantum-well system out of equilibrium, we find evidence of mobile, long-lived, negatively-charged quasiparticles, consistent with the idea that the pseudogap phase arises from strongly bound electron pairs.
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