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Giant Tunability of the Two-Dimensional Electron Gas at the Interface of γ-Al<sub>2</sub>O<sub>3</sub>/SrTiO<sub>3</sub>
Herein, we reported giant tunability of the physical properties of 2DEGs at the spinel/perovskite interface of {\gamma}-Al2O3/SrTiO3 (GAO/STO). By modulating the carrier density thus the band filling with ionic-liquid gating, the system experiences a Lifshitz transition at a critical carrier density of 3E13 cm-2, where a remarkably strong enhancement of …