Altermagnetic phase transition in a Lieb metal

TL;DR

This paper investigates a phase transition in a Lieb lattice system, revealing a novel altermagnetic order driven by sublattice interference rather than orbital effects.

Contribution

It introduces a microscopic model showing that altermagnetic order arises from sublattice interference, not orbital ordering, in a Lieb lattice.

Findings

Identifies a phase transition to altermagnetic order

Shows the mechanism is based on sublattice interference

Provides a microscopic understanding of the transition

Abstract

We analyze the phase transition between a symmetric metallic parent state and itinerant altermagnetic order. The underlying mechanism we reveal in our microscopic model of electrons on a Lieb lattice does not involve orbital ordering, but derives from sublattice interference.