Terahertz electron paramagnetic resonance generalized spectroscopic ellipsometry: The magnetic response of the nitrogen defect in 4H-SiC
Abstract
We report on terahertz (THz) electron paramagnetic resonance generalized spectroscopic ellipsometry (THz-EPR-GSE). Measurements of field and frequency dependencies of magnetic response due to spin transitions associated with nitrogen defects 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 polarization properties of the spin transitions, and we can obtain the k coordinated nitrogen g and hyperfine splitting parameters using magnetic field and frequency dependent Lorentzian oscillator line shape functions. Magnetic-field line broadening presently obscures access to h parameters. We show that measurements of THz-EPR-GSE at positive and negative fields differ fundamentally and hence provide additional information. We propose frequency-scanning THz-EPR-GSE as a versatile method to study properties of spins in solid state materials.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 07, 2022
- Source ID
- 10.1063/5.0082353
Entities
People
- Alexander Ruder
- K. Irmscher
- Mathias Schubert
- Megan Stokey
- Petr Neugebauer
- Philipp Kühne
- Rafał Korlacki
- Sean Knight
- Steffen Richter
- Vallery Stanishev
- Vanya Darakchieva
Organizations
- Air Force Office of Scientific Research
- Brno University of Technology
- Leibniz Institute for Crystal Growth
- Linköping University
- Lund University
- National Science Foundation
- Swedish Foundation for Strategic Research
- Swedish Governmental Agency for Innovation Systems
- Swedish Research Council
- University of Nebraska–Lincoln