A coupled spin-electron diamond chain with different Land\'e g-factors of localized Ising spins and mobile electrons

TL;DR

This paper investigates a coupled spin-electron diamond chain considering different Landé g-factors, revealing complex magnetic phases, entanglement phenomena, and magnetization plateaus influenced by an external magnetic field.

Contribution

It introduces a detailed analysis of the magnetic phases and quantum entanglement in a coupled spin-electron diamond chain with g-factor differences, which was not previously studied.

Findings

Identification of classical and quantum magnetic phases.

Observation of magnetization plateaus at low temperatures.

Quantum entanglement induced by magnetic field.

Abstract

A coupled spin-electron diamond chain with localized Ising spins placed on its nodal sites and mobile electrons delocalized over interstitial sites is explored in a magnetic field taking into account the difference between Land\'e g-factors of the localized spins and mobile electrons. The ground-state phase diagram is constituted by two classical ferrimagnetic phases, the quantum unsaturated paramagnetic phase and the saturated paramagnetic phase. Both classical ferrimagnetic phases as well as the unsaturated paramagnetic phase are reflected in a low-temperature magnetization curve as intermediate magnetization plateaus. The unsaturated paramagnetic phase is quantum in its character as evidenced by the fermionic concurrence calculated for a pair of the mobile electrons hopping in between the interstitial sites. It is shown that the magnetic field can under certain conditions induce a quantum entanglement above the disentangled ground state.