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PreprintCC BY 4.0arXiv

Chirality-Resolved Spectroscopy of Caroli-de Gennes-Matricon States in Multiband FeTe1−xSex Superconductors

  • T. Rõõm
  • A. Glezer Moshe
  • R. Nagarajan
  • U. Nagel
  • Hee Taek Yi
  • Seongshik Oh
  • G. Blumberg
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Abstract

We employ terahertz Faraday magneto-optical spectroscopy to probe the relaxation dynamics of quantized helical Caroli-de Gennes-Matricon (CdGM) states in epitaxial FeTe1−xSex thin films, nodeless multiband superconductors with short coherence lengths in the moderately clean limit. By exploiting polarization-selective optical transitions, we directly resolve the helicity and band origin of vortex-core quasiparticles. We observe long-lived CdGM resonances with opposite circular polarizations for electron- and hole-like bands. This enables independent, band-resolved determination of quasiparticle lifetimes, vortex masses, coherence lengths, and upper critical fields, and reveals their systematic evolution with isovalent substitution. The results establish terahertz magneto-optics as a direct probe of helical vortex-core excitations and provide dynamical evidence for multiband CdGM states in iron-based superconductors.

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Cite

BibTeXRIS
BibTeX
@misc{room2026chiralityresolved,
  title = {{Chirality-Resolved Spectroscopy of Caroli-de Gennes-Matricon States in Multiband FeTe$_1-x$Se$_x$ Superconductors}},
  author = {T. Rõõm and A. Glezer Moshe and R. Nagarajan and U. Nagel and Hee Taek Yi and Seongshik Oh and G. Blumberg},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2606.03637},
  eprint = {2606.03637},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.03637},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Chirality-Resolved Spectroscopy of Caroli-de Gennes-Matricon States in Multiband FeTe_1−xSe_x Superconductors
AU  - T. Rõõm
AU  - A. Glezer Moshe
AU  - R. Nagarajan
AU  - U. Nagel
AU  - Hee Taek Yi
AU  - Seongshik Oh
AU  - G. Blumberg
PY  - 2026
DA  - 2026/10/25
PB  - arXiv
DO  - 10.48550/arxiv.2606.03637
UR  - https://arxiv.org/abs/2606.03637
AB  - We employ terahertz Faraday magneto-optical spectroscopy to probe the relaxation dynamics of quantized helical Caroli-de Gennes-Matricon (CdGM) states in epitaxial FeTe_1−xSe_x thin films, nodeless multiband superconductors with short coherence lengths in the moderately clean limit. By exploiting polarization-selective optical transitions, we directly resolve the helicity and band origin of vortex-core quasiparticles. We observe long-lived CdGM resonances with opposite circular polarizations for electron- and hole-like bands. This enables independent, band-resolved determination of quasiparticle lifetimes, vortex masses, coherence lengths, and upper critical fields, and reveals their systematic evolution with isovalent substitution. The results establish terahertz magneto-optics as a direct probe of helical vortex-core excitations and provide dynamical evidence for multiband CdGM states in iron-based superconductors.
ER  -