Terahertz magneto-nanoscopy of encapsulated monolayer graphene
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866911621884936192 |
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| author | Kim, Richard H. J. Yang, Sunwoong Kim, Taehoon Haeuser, Samuel J. Park, Joong-Mok Chan, Randall K. Koschny, Thomas Bahk, Young-Mi Hong, Sung Ju Wang, Jigang |
| author_facet | Kim, Richard H. J. Yang, Sunwoong Kim, Taehoon Haeuser, Samuel J. Park, Joong-Mok Chan, Randall K. Koschny, Thomas Bahk, Young-Mi Hong, Sung Ju Wang, Jigang |
| contents | This study investigates the nanoscale conductivity of encapsulated monolayer graphene at temperatures down to 5 K and magnetic fields of up to 1 T. We use the scattering-type scanning near-field optical microscopy (s-SNOM) technique to probe magnetic-field-dependent responses from graphene close to charge neutrality in the terahertz spectral region. We observe the near-perfect high-$q$ reflector behavior of graphene but with subtle changes by the presence of magnetic fields. Measurements align with calculations of the magneto-optical conductivity and the near-field spectroscopic contrast that describes the field-tunable cyclotron resonance of Dirac fermions. Our result provides an initial step toward understanding temperature and magnetic-field effects on nanoscale terahertz transport in two-dimensional quantum materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_22940 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Terahertz magneto-nanoscopy of encapsulated monolayer graphene Kim, Richard H. J. Yang, Sunwoong Kim, Taehoon Haeuser, Samuel J. Park, Joong-Mok Chan, Randall K. Koschny, Thomas Bahk, Young-Mi Hong, Sung Ju Wang, Jigang Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons This study investigates the nanoscale conductivity of encapsulated monolayer graphene at temperatures down to 5 K and magnetic fields of up to 1 T. We use the scattering-type scanning near-field optical microscopy (s-SNOM) technique to probe magnetic-field-dependent responses from graphene close to charge neutrality in the terahertz spectral region. We observe the near-perfect high-$q$ reflector behavior of graphene but with subtle changes by the presence of magnetic fields. Measurements align with calculations of the magneto-optical conductivity and the near-field spectroscopic contrast that describes the field-tunable cyclotron resonance of Dirac fermions. Our result provides an initial step toward understanding temperature and magnetic-field effects on nanoscale terahertz transport in two-dimensional quantum materials. |
| title | Terahertz magneto-nanoscopy of encapsulated monolayer graphene |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.22940 |