Spin-to-Charge Conversion in 2D Electron Gas and Single-layer Graphene Devices

TL;DR

This paper provides analytical and numerical insights into spin-to-charge conversion in mesoscopic devices with 2D electron gas and graphene, explaining experimental discrepancies and advancing understanding of spintronics phenomena.

Contribution

It offers new analytical expressions for spin-to-charge conversion coefficients in ballistic quantum dots with 2D electron gas and graphene, supported by numerical simulations.

Findings

Analytical formulas for spin-to-charge conversion coefficients.

Numerical simulations confirm analytical results.

Explanation of experimental discrepancies in spin-to-charge conversion measurements.

Abstract

We investigate the spin-to-charge conversion emerging from a mesoscopic device connected to multiple terminals. We obtain analytical expressions to the characteristic coefficient of spin-to-charge conversion which are applied in two kinds of ballistic chaotic quantum dots at low temperature. We perform analytical diagrammatic calculations in the universal regime for two-dimensional electron gas and single-layer graphene with strong spin-orbit interaction in the universal regime. Furthermore, our analytical results are confirmed by numerical simulations. Finally, we connect our analytical finds to recent experimental measures giving a conceptual explanation about the apparent discrepancies between them.