TY - JOUR
T1 - Photoemission study of electronic structure evolution across the metalinsulator transition of heavily B-doped diamond
AU - Okazaki, H.
AU - Arakane, T.
AU - Sugawara, K.
AU - Sato, T.
AU - Takahashi, T.
AU - Wakita, T.
AU - Hirai, M.
AU - Muraoka, Y.
AU - Takano, Y.
AU - Ishii, S.
AU - Iriyama, S.
AU - Kawarada, H.
AU - Yokoya, T.
N1 - Funding Information:
This work was supported partly by a Grant-in-Aid for Scientific Research of the Ministry of Education, Culture, Sports, Science, and Technology, Japan ( 20340091 ).
PY - 2011/5
Y1 - 2011/5
N2 - We studied the electronic structure evolution of heavily B-doped diamond films across the metalinsulator transition (MIT) using ultraviolet photoemission spectroscopy (UPS). From higherature UPS, through which electronic states near the Fermi level (EF) up to ∼5kBT can be observed (kB is the Boltzmann constant and T the temperature), we observed the carrier concentration dependence of spectral shapes near EF. Using another carrier concentration dependent UPS, we found that the change in energy position of sp-band of the diamond valence band, which corresponds to the shift of EF, can be explained by the degenerate semiconductor model, indicating that the diamond valence band is responsible for the metallic states for samples with concentrations above MIT. We discuss a possible electronic structure evolution across MIT.
AB - We studied the electronic structure evolution of heavily B-doped diamond films across the metalinsulator transition (MIT) using ultraviolet photoemission spectroscopy (UPS). From higherature UPS, through which electronic states near the Fermi level (EF) up to ∼5kBT can be observed (kB is the Boltzmann constant and T the temperature), we observed the carrier concentration dependence of spectral shapes near EF. Using another carrier concentration dependent UPS, we found that the change in energy position of sp-band of the diamond valence band, which corresponds to the shift of EF, can be explained by the degenerate semiconductor model, indicating that the diamond valence band is responsible for the metallic states for samples with concentrations above MIT. We discuss a possible electronic structure evolution across MIT.
KW - A. Semiconductors
KW - A. Superconductors
KW - C. Photoelectron spectroscopy
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U2 - 10.1016/j.jpcs.2010.10.052
DO - 10.1016/j.jpcs.2010.10.052
M3 - Article
AN - SCOPUS:79955756853
SN - 0022-3697
VL - 72
SP - 582
EP - 584
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
IS - 5
ER -