TY - JOUR
T1 - Density-dependent electronic structure of zinc-blende-type MnAs dots on GaAs(001) studied by in situ photoemission spectroscopy
AU - Okabayashi, J.
AU - Mizuguchi, M.
AU - Ono, K.
AU - Oshima, M.
AU - Fujimori, A.
AU - Kuramochi, H.
AU - Akinaga, H.
N1 - Funding Information:
This work was done under the project 02S2-002 at the Institute of Materials Structure Science in KEK, and partially supported by the New Energy and Industrial Technology Development (NEDO) and a Grant-in-Aid for Scientific Research in Priority Area Semiconductor Nano-spintronics from the Ministry of Education, Culture, Sports, Science and Technology.
PY - 2004/12
Y1 - 2004/12
N2 - We report on the density dependence of the morphology and electronic structure of zinc-blende-type MnAs dots using in situ photoemission spectroscopy combined with molecular-beam epitaxy. Transmission electron microscopy images showed the zinc-blende-type crystalline structure of 10-nm diameter for each dot on sulfur-passivated GaAs(001) surface. The valence-band photoemission spectra of the MnAs dots were similar to those of the diluted magnetic semiconductor Ga1-xMnxAs. With increasing dot density, the characteristic spectra of the zinc-blende-type MnAs persist but a weak Fermi edge appears, suggesting a metallic behavior as a result of percolation between the dots or the appearance of hexagonal MnAs as a minority phase.
AB - We report on the density dependence of the morphology and electronic structure of zinc-blende-type MnAs dots using in situ photoemission spectroscopy combined with molecular-beam epitaxy. Transmission electron microscopy images showed the zinc-blende-type crystalline structure of 10-nm diameter for each dot on sulfur-passivated GaAs(001) surface. The valence-band photoemission spectra of the MnAs dots were similar to those of the diluted magnetic semiconductor Ga1-xMnxAs. With increasing dot density, the characteristic spectra of the zinc-blende-type MnAs persist but a weak Fermi edge appears, suggesting a metallic behavior as a result of percolation between the dots or the appearance of hexagonal MnAs as a minority phase.
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U2 - 10.1103/PhysRevB.70.233305
DO - 10.1103/PhysRevB.70.233305
M3 - Article
AN - SCOPUS:14044279149
VL - 70
SP - 1
EP - 4
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 23
M1 - 233305
ER -