English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Low density two-dimensional electron gases (2DEGs) with spin-orbit couplingare highly sensitive to an in-plane magnetic field, which impacts their Fermisurfaces and transport properties. Such 2DEGs, formed at transition metal oxidesurfaces or interfaces, can also undergo surface phase transitions leading topolar metals which exhibit electronic nematicity. Motivated by experiments onsuch systems, we theoretically study magnetotransport in $t_{2g}$ orbitalsystems, using Hamiltonians which include atomic spin-orbit coupling (SOC) andbroken inversion symmetry, for both square symmetry (001) and hexagonalsymmetry (111) 2DEGs. Using a numerical solution to the full multibandmatrix-Boltzmann equation, together with insights gleaned from the impurityscattering overlap matrix, we explore the anisotropic magnetoresistance (AMR)in the presence of impurities which favor small momentum scattering. We findthat transport in the (001) 2DEG is dominated by a single pair of bands, weaklycoupled by impurity scattering, one of which has a larger Fermi velocity whilethe other provides an efficient current-relaxation mechanism. This leads tostrong angle-dependent current damping and a large AMR with many angularharmonics. In contrast, AMR in the (111) 2DEG typically features a single$\cos(2\vartheta)$ harmonic, with the angle-averaged magnetoresistance beinghighly tunable by a symmetry-allowed trigonal distortion. We also explore howthe (111) 2DEG Fermi sufaces are impacted by electronic nematicity via asurface phase transition into a 2D polar metal for which we discuss a Landautheory, and show that this leads to distinct symmetry components and higherangular harmonics in the AMR. Our results are in qualitative agreement withexperiments from various groups for 2DEGs at the SrTiO$_3$ surface or theLaAlO$_3$-SrTiO$_3$ interface.

Anisotropic Magnetoresistance in Multiband Systems: 2DEGs and Polar Metals at Oxide Interfaces