Work

Ferromagnets from higher SU(N) representations

Year: 2025

Type: article

Abstract: We present a general formalism for deriving the thermodynamics of ferromagnets consisting of “atoms” carrying an arbitrary irreducible representation of S U ( N ) and coupled through long-range two-body quadratic interactions. Using this formalism, we derive the thermodynamics and phase structure of ferromagnets with atoms in the doubly symmetric or doubly antisymmetric irreducible representations. The symmetric representation leads to a paramagnetic and a ferromagnetic phase with transitions similar to the ones for the fundamental representation studied before. The antisymmetric representation presents qualitatively new features, leading to a paramagnetic and two distinct ferromagnetic phases that can coexist over a range of temperatures, two of them becoming metastable. Our results are relevant to magnetic systems of atoms with reduced symmetry in their interactions compared to the fundamental case.

Source: Nuclear Physics B

DOI: 10.1016/j.nuclphysb.2025.116880

Authors: Alexios P. Polychronakos, Konstantinos Sfetsos

Institutions: The Graduate Center, CUNY, City College of New York, City University of New York, National and Kapodistrian University of Athens

Language: English

Topic: Theoretical and Computational Physics

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond