EPITAXIAL METAL OXIDE AS BUFFER FOR EPITAXIAL III-V LAYERS

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Systems and methods are described herein for growing epitaxial metal oxide as buffer for epitaxial III-V layers. A layer structure includes a base layer and a first rare earth oxide layer epitaxially grown over the base layer. The first rare earth oxide layer includes a first rare earth element and oxygen, and has a bixbyite crystal structure. The layer structure also includes a metal oxide layer epitaxially grown directly over the first rare earth oxide layer. The metal oxide layer includes a first cation element selected from Group III and oxygen, and has a bixbyite crystal structure.