At oxygen-deficient LaAlO3/SrTiO3 interfaces, ARPES finds the Fermi momentum stays fixed while the metallic spectral weight grows, showing that added electrons expand metallic puddles instead of filling existing bands.
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Electronic phase separation at LaAlO3/SrTiO3 interfaces tunable by oxygen deficiency
At oxygen-deficient LaAlO3/SrTiO3 interfaces, ARPES finds the Fermi momentum stays fixed while the metallic spectral weight grows, showing that added electrons expand metallic puddles instead of filling existing bands.