Terahertz electron paramagnetic resonance generalized spectroscopic ellipsometry : The magnetic response of the nitrogen defect in 4H-SiC
(2022) In Applied Physics Letters 120(10).- 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... (More)
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.
(Less)
- author
- organization
- publishing date
- 2022-03-07
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Applied Physics Letters
- volume
- 120
- issue
- 10
- article number
- 102101
- publisher
- American Institute of Physics (AIP)
- external identifiers
-
- scopus:85126439258
- ISSN
- 0003-6951
- DOI
- 10.1063/5.0082353
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2022 Author(s).
- id
- a067e120-2a37-464d-941f-0c3b7d88609f
- date added to LUP
- 2022-04-19 14:38:25
- date last changed
- 2023-11-08 21:56:07
@article{a067e120-2a37-464d-941f-0c3b7d88609f, abstract = {{<p>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.</p>}}, author = {{Schubert, Mathias and Knight, Sean and Richter, Steffen and Kühne, Philipp and Stanishev, Vallery and Ruder, Alexander and Stokey, Megan and Korlacki, Rafał and Irmscher, Klaus and Neugebauer, Petr and Darakchieva, Vanya}}, issn = {{0003-6951}}, language = {{eng}}, month = {{03}}, number = {{10}}, publisher = {{American Institute of Physics (AIP)}}, series = {{Applied Physics Letters}}, title = {{Terahertz electron paramagnetic resonance generalized spectroscopic ellipsometry : The magnetic response of the nitrogen defect in 4H-SiC}}, url = {{http://dx.doi.org/10.1063/5.0082353}}, doi = {{10.1063/5.0082353}}, volume = {{120}}, year = {{2022}}, }