Electron mobility of a two-dimensional electron gas at the interface of SrTiO${}_3$ and LaAlO${}_3$

Abstract

We calculate the mobility of a two-dimensional electron gas residing at the interface of LaAlO${}_3$/SrTiO${}_3$ following a three band Boltzmann approach at low temperature, where carrier-charged impurity scattering process is assumed to be dominant. We explain the anisotropic characteristic of the dielectric function, which is a consequence of elliptical bands close to Fermi surface. The screening effect, which weakens the long-range Coulomb interaction of the electron-impurity is considered within the random phase approximation. Working at carrier densities high enough to neglect the spin-orbit induced splitting of the bands, we find that the mobility varies inversely with the cubic power of the carrier density ($n_{2D}^{-3}$) in good agreement with the experimental results. We also investigate the role of variable dielectric constant of SrTiO${}_3$, the multiband nature of the system and interband interactions in exploring this result.

arXiv comment7 pages, 5 figures

References in corpus (11)

• Magnetic effects at the interface between nonmagnetic oxides
• Why Some Interfaces Cannot be Sharp
• Tunable Rashba spin-orbit interaction at oxide interfaces
• Towards two-dimensional metallic behavior at LaAlO3/SrTiO3 interfaces
• Theory of the SrTiO3 Surface State Two-Dimensional Electron Gas
• First-principles modeling of electrostatically doped perovskite systems
• Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface
• Origin and Transport Signatures of Spin-Orbit Interactions in One- and Two-Dimensional SrTiO${}_3$-Based Heterostructures
• Semiclassical framework for the calculation of transport anisotropies
• Quasiparticle Mass Enhancement and Fermi Surface Shape Modification in Oxide Two-Dimensional Electron Gases
• Transport and thermoelectric properties of the LaAlO${}_3$/SrTiO${}_3$ interface

Cited by in corpus (8)

• Thermoelectric transport in monolayer phosphorene
• Thermoelectric transport properties of borophane
• Thermoelectric effects in topological crystalline insulators
• Plasmons at the LaAlO${}_3$/SrTiO${}_3$ interface and Graphene-LaAlO${}_3$/SrTiO${}_3$ double layer
• Temperature-Dependent Band Structure of SrTiO${}_3$ Interfaces
• Orbital and spin order in oxide two-dimensional electron gases
• Magnetoresistance in Noncentrosymmetric Two-dimensional Systems
• Magnetotransport of a 2DEG with anisotropic Rashba interaction at the LaAlO${}_3$/SrTiO${}_3$ interface