Spin Peltier effect in graphene

TL;DR

This paper presents a theoretical study of the spin-Peltier effect in graphene/ferromagnetic insulator heterostructures, highlighting how Landau level crossings amplify spin-induced thermal responses.

Contribution

It introduces a microscopic formalism to analyze spin-flip scattering and predicts enhanced spin-Peltier effects due to Landau level crossings in graphene under magnetic fields.

Findings

Landau level crossings significantly boost spin-flip scattering.

Spin-induced temperature differences can probe electronic energy levels.

The framework aids understanding of spin-thermal effects in Dirac material hybrids.

Abstract

In this work, we theoretically investigate the spin-Peltier effect in a heterostructure composed of graphene and a ferromagnetic insulator (FI). Using a microscopic formalism based on the characteristic spin-flip scattering length at the graphene/FI interface, we analyze how spin accumulation in graphene gives rise to a temperature difference across the junction. We show that, in the presence of an external magnetic field, the electronic spectrum of graphene is quantized into Landau levels, which strongly modifies the available spin-flip scattering channels. In particular, crossings between Landau levels significantly enhance the spin-flip scattering amplitude, leading to a pronounced amplification of the spin-Peltier response. Our results suggest that measurements of the spin-induced temperature difference in graphene-FI heterostructures can serve as a sensitive probe of discrete electronic energy levels. More broadly, this work provides a theoretical framework for understanding spin-driven thermal effects in hybrid systems combining Dirac materials and magnetic insulators.