Giant tunability of the two-dimensional electron gas at the interface of gamma-Al2O3/SrTiO3

Abstract

Herein, we reported giant tunability of the physical properties of 2DEGs at the spinel/perovskite interface of γ-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 Rashba spin-orbit interaction and an emergence of Kondo effect at low temperatures are observed. Moreover, as the carrier concentration depletes with decreasing gating voltage, the electron mobility is enhanced by more than 6 times in magnitude, leading to the observation of clear quantum oscillations. The great tunability of GAO/STO interface by EDLT gating not only shows promise for design of oxide devices with on-demand properties, but also sheds new light on the electronic structure of 2DEG at the non-isostructural spinel/perovskite interface.

arXiv commentNano Letters 2017

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Cited by in corpus (10)

• Magnetic and electronic properties at the gamma-Al2O3/SrTiO3 interface
• Gate-tunable Rashba spin-orbit coupling and spin polarization at diluted oxide interfaces
• Band-Order Anomaly at the γ-Al2O3/SrTiO3 Interface Drives the Electron-Mobility Boost
• Correlation between Superconductivity, Band Filling and Electron Confinement at the LaAlO${}_3$-SrTiO${}_3$ Interface
• Ferroelectric control of spin-polarized two-dimensional electron gas
• Buried Moire supercells through SrTiO${}_3$ nanolayer relaxation
• Possible Flexoelectric Origin of the Lifshitz Transition in LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Magnetic transition and spin-polarized two-dimensional electron gas controlled by polarization switching in strained CaMnO${}_3$/BaTiO${}_3$ slabs
• Magnetism and nonlinear charge transport in NiFe2O4/γ-Al2O3/SrTiO3 heterostructure: Toward Spintronic Applications
• Coupling between tilts and charge carriers at polar-nonpolar perovskite interfaces