Skip to content
DraconiticResearch
Search Sources API
201,818 studies31 sourcesUpdated 37 min ago
PreprintCC BY 4.0arXiv

Optical manifestations of loop currents in Haldane's model and in time-reversal-breaking superconductors

  • Azzam S. Alzahrani
  • Victor M. Yakovenko
Open at sourcePDFDOICite

Abstract

We present a theoretical study of optical manifestations of loop currents in Haldane's model and in time-reversal-breaking superconductors. For Haldane's model, we calculate the expectation value of loop currents in terms of model parameters and relate it with the integrated optical spectral weight for the frequency-dependent ac Hall conductivity. Thus, experimental measurements of the latter can provide information about the presence and magnitude of steady loop currents in the system. Then we elaborate on loop currents in a chiral superconductor on the honeycomb lattice, studied earlier by Brydon et al. (2019). We demonstrate that a sharp optical absorption peak in the ac Hall conductivity originates from excitations between the lower and upper Dirac bands, activated by the time-reversal-breaking superconductivity. The frequency of the peak is twice the energy difference between the Fermi level and the Dirac point. The optical spectral weight of the peak is directly related to the magnitude of loop currents induced in the unit cells by the chiral superconducting pairing, in similarity to Haldane's model.

Related

  1. Theory of the intrinsic optical anomalous Hall responses in time-reversal symmetry breaking superconductors
    Jia-Long Zhang, Wen Huang
    arXivPreprintCC BY 4.0Full textAtomic, molecular & optical physicsCondensed matterarXiv
  2. Spontaneous persistent currents and time-reversal symmetry breaking in thick-walled Weyl semimetal cylinders
    J. C. Pérez-Pedraza, Juan A. Cañas, Daniel A. Bonilla +1
    arXivPreprintarXiv licenceFull textCondensed matterarXiv
  3. Eddy currents and current reversal in curved magnetic thin-film Josephson junctions
    Einar Skoglund, Maxim A. Tjøtta, Sol H. Jacobsen
    arXivPreprintarXiv licenceFull textCondensed matterQuantum physics & quantum informationarXiv
  4. Quantum manifestations of converse symmetry breaking
    Daniel P. Buser, Biswabibek Bandyopadhyay, Adilson E. Motter
    arXivPreprintarXiv licenceFull textCondensed matterQuantum physics & quantum informationarXiv
  5. Time-reversal symmetry breaking and inherent Josephson diodes in a multi-component order parameter superconductor
    Remko Fermin, Matthijs Rog, Guido Stam +6
    Communications PhysicsPeer-reviewedCC BY-NC-ND 4.0Full textCondensed matterNatureCrossref

Cite

BibTeXRIS
BibTeX
@misc{alzahrani2026optical,
  title = {{Optical manifestations of loop currents in Haldane's model and in time-reversal-breaking superconductors}},
  author = {Azzam S. Alzahrani and Victor M. Yakovenko},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2608.22083},
  eprint = {2608.22083},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.22083},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Optical manifestations of loop currents in Haldane's model and in time-reversal-breaking superconductors
AU  - Azzam S. Alzahrani
AU  - Victor M. Yakovenko
PY  - 2026
DA  - 2026/09/21
PB  - arXiv
DO  - 10.48550/arxiv.2608.22083
UR  - https://arxiv.org/abs/2608.22083
AB  - We present a theoretical study of optical manifestations of loop currents in Haldane's model and in time-reversal-breaking superconductors. For Haldane's model, we calculate the expectation value of loop currents in terms of model parameters and relate it with the integrated optical spectral weight for the frequency-dependent ac Hall conductivity. Thus, experimental measurements of the latter can provide information about the presence and magnitude of steady loop currents in the system. Then we elaborate on loop currents in a chiral superconductor on the honeycomb lattice, studied earlier by Brydon et al. (2019). We demonstrate that a sharp optical absorption peak in the ac Hall conductivity originates from excitations between the lower and upper Dirac bands, activated by the time-reversal-breaking superconductivity. The frequency of the peak is twice the energy difference between the Fermi level and the Dirac point. The optical spectral weight of the peak is directly related to the magnitude of loop currents induced in the unit cells by the chiral superconducting pairing, in similarity to Haldane's model.
ER  -