# Electronic transport in thin films of BaPbO$_3$: Unraveling two-dimensional quantum effects

## TL;DR

This study investigates the quantum effects influencing electronic transport in thin BaPbO$_3$ films, highlighting the roles of spin--orbit coupling, disorder, and electron interactions, which are crucial for topological applications.

## Contribution

It provides a detailed analysis of two-dimensional quantum effects in BaPbO$_3$ thin films, elucidating the interplay of spin--orbit coupling, disorder, and electron interactions.

## Key findings

- Weak antilocalization dominates magnetotransport.
- Electron-electron interactions significantly affect temperature dependence.
- Quantum effects are essential for controlling properties of BaPbO$_3$ films.

## Abstract

Recently, perovskite related BaPbO$_3$ has attracted attention due to its hidden topological properties and, moreover, has been used as a thin layer in heterostructures to induce two-dimensional superconductivity. Here we investigate the normal state electronic transport properties of thin films of BaPbO$_3$. Temperature and magnetic field dependent sheet resistances are strongly affected by two-dimensional quantum effects. Our analysis decodes the interplay of spin--orbit coupling, disorder, and electron--electron interaction in this compound. Similar to recently discussed topological materials, we find that weak antilocalization is the dominant protagonist in magnetotransport, whereas electron--electron interactions play a pronounced role in the temperature dependence. A systematic understanding of these quantum effects is essential to allow for an accurate control of properties not only of thin films of BaPbO$_3$, but also of topological heterostructures.