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

Schubert, Mathias ; Knight, Sean ; Richter, Steffen LU ; Kühne, Philipp ; Stanishev, Vallery ; Ruder, Alexander ; Stokey, Megan ; Korlacki, Rafał ; Irmscher, Klaus and Neugebauer, Petr , et al. (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.

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organization
publishing date
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}},
}