Terahertz magneto-nanoscopy of encapsulated monolayer graphene
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 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.
Authors
- Thomas Koschny (ORCID: https://orcid.org/0000-0003-4960-9266)
- R. K. Chan (ORCID: https://orcid.org/0009-0009-6368-8918)
- Joong‐Mok Park
- Young‐Mi Bahk (ORCID: https://orcid.org/0000-0001-7039-3135)
- Samuel Haeuser (ORCID: https://orcid.org/0000-0003-4262-5538)
- Richard H. J. Kim (ORCID: https://orcid.org/0000-0002-4244-9653)
- Sung Ju Hong (ORCID: https://orcid.org/0000-0003-1318-2141)
- Taehoon Kim (ORCID: https://orcid.org/0000-0003-2145-5293)
- Jigang Wang (ORCID: https://orcid.org/0000-0002-6159-4119)
- Sunwoong Yang
Institutions
- Incheon National University (KR)
- Kangwon National University (KR)
- Iowa State University (US)
- Ames National Laboratory (US)
Publication Details
- Journal
- Journal of Applied Physics
- Published
- 2026-04-24
- DOI
- https://doi.org/10.1063/5.0310548
- Primary Topic
- Graphene research and applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- U.S. Department of Energy
- Iowa State University
- National Research Foundation
- National Research Foundation of Korea
- Ames Laboratory
- Division of Materials Sciences and Engineering