Microwave spectroscopic evidence of a moiré-commensurate electron crystal in monolayer graphene

Abstract

We probe the conductivity of the lowest Landau level of a moiré-aligned monolayer graphene device by broadband microwave transmission through a coplanar waveguide (∼50 mK, 15.4--18 T), isolating the longitudinal channel through a low-minus-high frequency band difference D(ν). We resolve a series of minima in D(ν) that drift with field along lines of fixed carrier density rather than fixed Landau filling, the hallmark of moiré-commensurate electron crystals. The strongest minimum is present at every field and matches no fractional quantum Hall or integer Hofstadter state. It lies at band filling s=1/3, one electron for every three moiré cells---the generalized Wigner crystal that DaSilva, Jung, and MacDonald predict as the most favorable fixed-density (t=0) commensuration. The weaker minima fall near neighboring commensurate fillings.

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BibTeX

@misc{solodovnyk2026microwave,
  title = {{Microwave spectroscopic evidence of a moiré-commensurate electron crystal in monolayer graphene}},
  author = {A. Solodovnyk and P. Colgan and K. Watanabe and T. Taniguchi and L. W. Engel and S. Dietrich},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.21875},
  eprint = {2610.21875},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.21875},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Microwave spectroscopic evidence of a moiré-commensurate electron crystal in monolayer graphene
AU  - A. Solodovnyk
AU  - P. Colgan
AU  - K. Watanabe
AU  - T. Taniguchi
AU  - L. W. Engel
AU  - S. Dietrich
PY  - 2026
DA  - 2026/10/15
PB  - arXiv
DO  - 10.48550/arxiv.2610.21875
UR  - https://arxiv.org/abs/2610.21875
AB  - We probe the conductivity of the lowest Landau level of a moiré-aligned monolayer graphene device by broadband microwave transmission through a coplanar waveguide (∼50 mK, 15.4--18 T), isolating the longitudinal channel through a low-minus-high frequency band difference D(ν). We resolve a series of minima in D(ν) that drift with field along lines of fixed carrier density rather than fixed Landau filling, the hallmark of moiré-commensurate electron crystals. The strongest minimum is present at every field and matches no fractional quantum Hall or integer Hofstadter state. It lies at band filling s=1/3, one electron for every three moiré cells---the generalized Wigner crystal that DaSilva, Jung, and MacDonald predict as the most favorable fixed-density (t=0) commensuration. The weaker minima fall near neighboring commensurate fillings.
ER  -

Abstract

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