# Anti-Localization in Oxides: Effective Spin-3/2 Model

## TL;DR

This paper introduces an effective three-band model for oxide surfaces and interfaces to better understand weak anti-localization phenomena related to spin-orbit coupling, extending beyond traditional spin-1/2 models.

## Contribution

It develops a novel three-band model with a pseudo-spin 1/2+3/2 decomposition to analyze weak anti-localization in oxides, capturing new spin sectors.

## Key findings

- Identifies new quintet and septet sectors affecting transport signatures.
- Extends the theoretical framework for spin-orbit coupling in oxide interfaces.
- Provides a more comprehensive model for experimental analysis.

## Abstract

Weak anti-localization offers an experimental tool to address spin--orbit coupling of two-dimensional oxide surfaces and interfaces via magneto-transport. To overcome the shortcomings of the formulation for single-band spin-1/2 electrons, we consider an effective three-band model that allows a decomposition into a pseudo-spin representation 1/2+3/2. Whereas the well-established spin-1/2 transport signature results from the singlet and triplet sectors in the Cooperon equation, a new structure originates from the quintet and septet sectors generated by the spin 3/2x3/2 representation.