Signatures of Chiral Anomaly in the Magnetoresistance of a Quasi-3-Dimensional Electron Gas at the Interface of LaVO$_3$ and KTaO$_3$

TL;DR

This paper reports the observation of chiral anomaly signatures, such as negative magnetoresistance and oscillatory effects, at the LaVO$_3$/KTaO$_3$ interface, indicating topological electronic behavior in a quasi-3D electron gas.

Contribution

It provides experimental evidence of chiral anomaly signatures in a novel oxide interface, expanding the understanding of topological effects in complex oxides.

Findings

Negative longitudinal magnetoresistance observed

Oscillatory behavior in planar Hall effect and magnetoresistance

Strong temperature dependence indicating correlated phenomena

Abstract

In a Dirac semimetal charges flow between two Weyl nodes when electric and magnetic fields (B||E) are parallel to each other manifesting interesting physical properties such as negative longitudinal magnetoresistance, planar Hall effect and anisotropic magnetoresistance. We observe a co-existence of weak antilocalization with large negative longitudinal magnetoresistance and an unusual Hall resistance with (B||E) configuration, at the conducting interface of LaVO$_3$ and KTaO$_3$. The depth of the conducting channel at the interface is estimated to be around 30 nm by using spectroscopy techniques of photoluminescence and time-correlated single-photon counting. Both planar Hall effect and anisotropic magnetoresistance exhibit oscillatory behaviour as a function of the angle between E and B. A very similar temperature dependence of negative longitudinal magnetoresistance, planar Hall effect and anisotropic magnetoresistance suggest a strong correlation among them.