Terahertz magneto-nanoscopy of encapsulated monolayer graphene
Abstract
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.
Article Details
Journal Info
Journal of Applied Physics
American Institute of Physics
Authors (10)
Richard H. J. Kim
Ames National Laboratory, US Department of Energy 1 , Ames, Iowa 50011,
Sunwoong Yang
Division of Science Education, Kangwon National University 2 , Chuncheon 24341,
Taehoon Kim
Silklab, Department of Biomedical Engineering, Tufts University
Samuel J. Haeuser
Department of Physics and Astronomy, Iowa State University 2 , Ames, Iowa 50011,
Joong-Mok Park
Ames National Laboratory, US Department of Energy 1 , Ames, Iowa 50011,
Randall K. Chan
Department of Physics and Astronomy, Iowa State University 2 , Ames, Iowa 50011,
Thomas Koschny
Ames National Laboratory, US Department of Energy 1 , Ames, Iowa 50011,
Young-Mi Bahk
Department of Physics, Incheon National University 3 , Incheon 22012,
Sung Ju Hong
Division of Science Education, Kangwon National University 2 , Chuncheon 24341,
Jigang Wang
Artemisinin Research Center and Institute of Chinese Materia Medica