ULTRAHIGH MAGNETIC FIELD OPTICAL STUDY OF SINGLE-WALLED CARBON NANOTUBES FILM

Mukhtar Effendi (Physics Study Program, Jenderal Soedirman University Jl. dr. Soeparno No. 61 Purwokerto, Kode Pos 53123, Indonesia)
Hiroyuki Yokoi (Graduate School of Science and Technology, Kumamoto University Kumamoto 862-8555, Japan)
Nobutsuga Minami (Nanotechnology Research Institute,National Institute of Industrial Science and Technology Tsukuba, Ibaraki 305-8565, Japan)
Eiji Kominama (The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan)
Shojiro Takeyama (The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan)

JURNAL FISIKA
Vol 1, No 2 (2011)

Excitons in Single-Walled Carbon Nanotubes (SWNTs) have emerged as an ideal candidate for exploring one-dimensional (1-D) exciton physics. Exciton states which dominate optical properties of SWNTs even at room temperature, are not clarify yet. The optical absorption spectra of aligned SWNTs films under ultra high magnetic fields up to 190 T are examined to investigate this issue. Shifting and splitting of the absorption peaks due to Aharonov-Bohm effect was observed clearly above 80 T in the configuration where the magnetic fields were applied in parallel to the alignment of SWNTs. The lowest singlet exciton state has been determined through the analysis of energy splitting of excitons by the application of magnetic fields.   Keywords: blue shift, optically active, optically inactive, red shift, single-turn coil system