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PreprintCC BY 4.0arXiv

Electronic state of vortices at twin boundaries in a nematic superconductor

  • Keita Goto
  • Hiroto Adachi
  • Masanori Ichioka
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Abstract

Local electronic states of vortices in an s ± d wave nematic superconductor are studied both in the absence and presence of twin boundaries. The Bogoliubov-de Gennes theory for a tight-binding model is used with its nematicity represented by the anisotropy in the transfer integrals and attractive interactions between the nearest-neighbor sites. We evaluate s and d wave components of the pair potentials and the local density of states, and analyze the effects of nematicity on the vortex core structures with/without twin boundaries. We find that a single vortex trapped at the twin boundary is composed of a bound pair of fractional vortices accompanied by weakly-induced s ± id wave components, despite that such s ± id wave components do not appear in a zero magnetic field. The calculated spatial structures of the local electronic states are compared with the vortex image measured by STM experiments in an iron-based superconductor FeSe.

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Cite

BibTeXRIS
BibTeX
@misc{goto2026electronic,
  title = {{Electronic state of vortices at twin boundaries in a nematic superconductor}},
  author = {Keita Goto and Hiroto Adachi and Masanori Ichioka},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.28994},
  eprint = {2608.28994},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.28994},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Electronic state of vortices at twin boundaries in a nematic superconductor
AU  - Keita Goto
AU  - Hiroto Adachi
AU  - Masanori Ichioka
PY  - 2026
DA  - 2026/08/29
PB  - arXiv
DO  - 10.48550/arxiv.2608.28994
UR  - https://arxiv.org/abs/2608.28994
AB  - Local electronic states of vortices in an s ± d wave nematic superconductor are studied both in the absence and presence of twin boundaries. The Bogoliubov-de Gennes theory for a tight-binding model is used with its nematicity represented by the anisotropy in the transfer integrals and attractive interactions between the nearest-neighbor sites. We evaluate s and d wave components of the pair potentials and the local density of states, and analyze the effects of nematicity on the vortex core structures with/without twin boundaries. We find that a single vortex trapped at the twin boundary is composed of a bound pair of fractional vortices accompanied by weakly-induced s ± id wave components, despite that such s ± id wave components do not appear in a zero magnetic field. The calculated spatial structures of the local electronic states are compared with the vortex image measured by STM experiments in an iron-based superconductor FeSe.
ER  -