We present a comprehensive transport study of interface superconductivity in ${\mathrm{La}}_2{\mathrm{CuO}}_4/{\mathrm{LaSrCuO}}_4$ [LCO/LSCO(1.0)] bilayers, where both constituent layers are insulating in bulk. Our experiments reveal that superconductivity is localized within the LCO layer, with holes exhibiting a decaying distribution that extends up to 5 unit cells, reaching optimal superconductivity at the third ${\mathrm{CuO}}_2$ plane. Furthermore, Hall effect measurements indicate a mobile electron layer in LSCO(1.0), suggesting a unique coexistence of electrons and holes at the interface. Superconductivity persists in bilayers with total thickness as thin as 1.5 unit cells. These results provide insights into charge-carrier dynamics at cuprate interfaces and demonstrate robust interfacial superconductivity down to the ultrathin limit.

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• Hall effect
• Superconductivity
• Bilayer films
• Cuprates
• Interfaces
• Resistivity measurements