Which phenomenon causes metallic conduction at interfaces between two insulating oxides?

💡 Explanation

When two insulating oxides are joined forming a heterostructure, interface charge carrier quantum confinement occurs because the conduction band edge of one oxide lies below the Fermi level of the other, creating a confined two-dimensional electron gas. Therefore metallic conduction results, rather than alignment, ordering, or resonance which all require different underlying conditions.

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