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The misfit oxide, Bi$_{2}$Ba$_{1.3}$K$_{0.6}$Co$_{2.1}$O$_{y}$, made ofalternating rocksalt-structured [BiO/BaO] layers and hexagonal CoO$_{2}$layers, was studied by angle-resolved photoemission spectroscopy. Detailedelectronic structure of such a highly strained oxide interfaces is revealed forthe first time. We found that under the two incommensurate crystal fields,electrons are confined within individual sides of the interface, and scatteredby umklapp scattering of the crystal field from the other side. In addition,the high strain on the rocksalt layer raises its chemical potential and induceslarge charge transfer to the CoO$_{2}$ layer. Furthermore, a novel interfaceeffects, the interfacial enhancement of electron-phonon interactions, isdiscovered. Our findings of these electronic properties lay a foundation fordesigning future functional oxide interfaces.

Novel electronic structure induced by a highly strained oxide interface with incommensurate crystal fields