Terahertz electron paramagnetic resonance generalized spectroscopic ellipsometry: The magnetic response of the nitrogen defect in 4H-SiC

TL;DR

This paper introduces a novel terahertz electron paramagnetic resonance generalized spectroscopic ellipsometry (THz-EPR-GSE) technique that enables detailed analysis of spin transitions in solid-state materials without the need for cavities or modulation.

Contribution

The paper presents a new THz-EPR-GSE method that allows independent scanning of magnetic field and frequency, providing comprehensive characterization of spin properties in materials.

Findings

Successfully measured magnetic responses of nitrogen defects in 4H-SiC

Determined g-factors and hyperfine splittings from measurements

Proposed frequency-scanning THz-EPR-GSE as a versatile spin analysis tool

Abstract

We report on terahertz (THz) electron paramagnetic resonance generalized spectroscopic ellipsometry (THz-EPR-GSE). Measurements of the field and frequency dependencies of the magnetic response due to the spin transitions associated with the nitrogen defect in 4H-SiC are shown as an example. THz-EPR-GSE dispenses with the need of a cavity, permits independently scanning field and frequency parameters, and does not require field or frequency modulation. We investigate spin transitions of hexagonal ($h$) and cubic ($k$) coordinated nitrogen including coupling with its nuclear spin (I=1), and we propose a model approach for the magnetic susceptibility to account for the spin transitions. From the THz-EPR-GSE measurements we can fully determine the polarization properties of the spin transitions and we obtain $g$ and hyperfine splitting parameters using magnetic field and frequency dependent Lorentzian oscillator lineshape functions. We propose frequency-scanning THz-EPR-GSE as a new and versatile method to study properties of spins in solid state materials.