Field-controlled spin current in frustrated spin chains

TL;DR

This paper investigates the emergence of spontaneous spin currents in frustrated antiferromagnetic spin chains under strong magnetic fields, using advanced numerical methods to analyze different spin magnitudes and their critical behaviors.

Contribution

It introduces a non-Abelian symmetry-based DMRG approach to study spin currents in frustrated chains with various spin values, revealing field-dependent properties and critical exponents.

Findings

Spontaneous spin currents occur in frustrated chains under strong magnetic fields.

The order parameter and critical exponents vary with magnetic field and spin magnitude.

Numerical results detail the behavior for S=1/2, 1, 3/2, and 2 chains.

Abstract

We study states with spontaneous spin current, emerging in frustrated antiferromagnetic spin-$S$ chains subject to a strong external magnetic field. As a numerical tool, we use a non-Abelian symmetry realization of the density matrix renormalization group. The field dependence of the order parameter and the critical exponents are presented for zigzag chains with S=1/2, 1, 3/2, and 2.