Thermally excited multi-band conduction in LaAlO3/SrTiO3 heterostructures exhibiting magnetic scattering

Abstract

Magnetotransport measurements of charge carriers at the interface of a LaAlO3/SrTiO3 heterostructure with 26 unit cells of LaAlO3 show Hall resistance and magnetoresistance which at low and high temperatures is described by a single channel of electron-like charge carriers. At intermediate temperatures, we observe non-linear Hall resistance and positive magnetoresistance, establishing the presence of at least two electron-like channels with significantly different mobilities and carrier concentrations. These channels are separated by 6 meV in energy and their temperature dependent occupation and mobilities are responsible for the observed transport properties of the interface. We observe that one of the channels has a mobility that decreases with decreasing temperature, consistent with magnetic scattering in this channel.

6 pages, 4 figures

References in corpus (8)

• Magnetic effects at the interface between nonmagnetic oxides
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• High Mobility in LaAlO3/SrTiO3 Heterostructures: Origin, Dimensionality and Perspectives
• Polar Discontinuity Doping of the LaVO_3/SrTiO_3 Interface
• Direct k-space mapping of the electronic structure in an oxide-oxide interface
• Oxide Heterostructures for Efficient Solar Cells
• Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures
• k.p subband structure of the LaAlO3/SrTiO3 interface

Cited by in corpus (8)

• The mechanism of spin-orbit coupling in a 2D oxide interface
• Temperature-Dependent Band Structure of SrTiO${}_3$ Interfaces
• Nature of electrons from oxygen vacancies and polar catastrophe at LaAlO3/SrTiO3 interfaces
• Anomalous conductivity, Hall factor, magnetoresistance, and thermopower of accumulation layer in ${\text{SrTiO}}_3$
• Transport and thermoelectric properties of the LaAlO${}_3$/SrTiO${}_3$ interface
• Quantum oscillations in an optically-illuminated two-dimensional electron system at the LaAlO${}_3$/SrTiO${}_3$ interface
• Beyond being free: glassy dynamics of SrTiO${}_3$-based two-dimensional electron gas
• Sign-changing non-monotonic voltage gain of HfO2/Parylene-C/SrTiO3 field-effect transistor due to percolative insulator to two-dimensional metal transition