*** note the change in location *** Spin-Orbit Driven Transition of the (111) LaTiO3/SrTiO3 Interface Fermi Surface Under Magnetic Fields

by Mr. Gal Tuvia

TAU

at Condensed Matter Seminar

Mon, 29 May 2023, 11:10
Building 28 room 105

Abstract

When systems containing spin-orbit interaction are subjected to a magnetic field, the spin-split electronic bands become asymmetric, resulting in components in resistance which are linear with current and magnetic field. Here, we study the role of spin-orbit interaction in the (111) LaTiO3/SrTiO3 interface by focusing on such asymmetric transport effects. We observe a significant increase in the asymmetric resistance at a critical in-plane magnetic field Hc. Furthermore, we find that this enhancement vanishes when a minuscule out-of-plane magnetic field is applied. By employing a minimal model that incorporates Rashba-type spin-orbit interaction, we demonstrate that these results can be explained by the intersection of the spin-split Fermi contours at the critical field Hc. The presence of an out-of-plane magnetic field opens a gap through the Zeeman interaction, which we show to substantially diminish the enhancement effect. We speculate that certain magnetoresistance effects observed at different interfaces could be understood within the framework of the Fermi surface transition studied here.

Created on 24-05-2023 by Meidan, Dganit (dganit)
Updaded on 28-05-2023 by Meidan, Dganit (dganit)