Enhanced two dimensional electron gas charge densities at III-III/I-V oxide heterostructure interfaces

Abstract

In this paper, density functional theory calculations are used to explore the electronic and atomic reconstruction at interfaces between III-III/I-V oxides. In particular, at these interfaces, two dimensional electron gases (2DEGs) with twice the interfacial charge densities of the prototypical LaTiO3/SrTiO3 heterostructure are observed. Furthermore, a significant decrease in the band effective masses of the conduction electrons is shown, suggesting that possible enhancements in electron mobilities may be achievable. These findings represent a framework for chemically modulating 2DEGs, thereby providing a platform through which the underlying physics of electron confinement can be explored with implications for modern microelectronic devices.

References in corpus (12)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Magnetic effects at the interface between nonmagnetic oxides
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO3
• Origin of charge density at LaAlO3-on-SrTiO3 hetero-interfaces; possibility of intrinsic doping
• Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface
• Avoiding the polarization catastrophe in LaAlO3 overlayers on SrTiO3(001) through a polar distortion
• Subband structure of a two-dimensional electron gas formed at the polar surface of the strong spin-orbit perovskite KTaO${}_3$
• Lattice polarization effects on electron-gas charge densities in ionic superlattices
• Electronic charges and electric potential at LaAlO3/SrTiO3 interfaces studied by core-level photoemission spectroscopy
• Oxide superlattices with alternating p and n interfaces
• Metallic interface at the boundary between band and Mott insulators

Cited by in corpus (11)

• Origin of two-dimensional electron gases at oxide interfaces: insights from theory
• 2DEGs at perovskite interfaces between KTaO3 or KNbO3 and stannates
• Fractionally delta-doped oxide superlattices for higher carrier mobilities
• Thickness Dependent Carrier Density at the Surface of SrTiO3 (111) Slabs
• Coexistence of superconductivity and weak anti-localization at KTaO3 (111) interfaces
• Electronic subbands in the a-LaAlO${}_3$/KTaO${}_3$ interface revealed by quantum oscillations in high magnetic fields
• Ionic modulation at the LaAlO${}_3$/KTaO${}_3$ interface for extreme high-mobility two-dimensional electron gas
• Design and realization of Ohmic and Schottky interfaces for oxide electronics
• Piezoelectric properties of ferroelectric perovskite superlattices with polar discontinuity
• Ferroelectricity-induced asymmetrical two-dimensional electron gas in superlattices consisteing of insulating GdTiO3 and ferroelectric BaTiO3
• Layer-dependent electronic structures and magnetic ground states of polar-polar $\mathrm{LaV}{\mathrm{O}}_3/KTa{\mathrm{O}}_3$ (001) heterostructures