Kondo physics versus spin gap physics in fully spin-split quantum wires

TL;DR

This paper investigates the transport properties of fully spin-split quantum wires under high magnetic fields, revealing a density-dependent energy gap and complete spin polarization in the first subband, advancing understanding of spin-related quantum phenomena.

Contribution

It provides new experimental insights into spin-split quantum wires, highlighting the behavior of energy gaps and spin polarization under specific magnetic field conditions.

Findings

Density-dependent energy gap between spin subbands

Complete spin polarization of the first subband at high bias

Consistent experimental results supporting theoretical models

Abstract

Linear and nonlinear transport of quantum wires is investigated at a magnetic field where spin-split one-dimensional (1D) subbands are equidistant in energy. In this seldom-studied regime, experiments are consistent with a density-dependent energy gap between spin subbands, and with a complete spin polarization of the first 1D subband under a large source-drain bias at zero field.