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Title
Japanese: 
English:Optical properties of ZnO : Al epilayers: Observation of room-temperature many-body absorption-edge singularity 
Author
Japanese: 牧野 哲征, 田村 謙太郎, Chia Chin Hau, 瀬川 勇三朗, 川崎 雅司, 大友 明, 鯉沼 秀臣.  
English: T. Makino, K. Tamura, C. H. Chia, Y. Segawa, M. Kawasaki, A. Ohtomo, H. Koinuma.  
Language English 
Journal/Book name
Japanese: 
English:Physical Review B 
Volume, Number, Page Vol. 65    No. 12    121201(R)-1-4
Published date Mar. 2002 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
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File
Official URL <Go to ISI>://000174938800004
 
DOI https://doi.org/10.1103/PhysRevB.65.121201
Abstract We have studied the evolution of optical absorption spectra in eight samples of n type ZnO:Al as a function of excess electron concentration up to 6.7x10(20) cm(-3) at 300 K. The spectral assignment is examined by taking the many-body effect due to the presence of high-density electron gas into account. We propose that absorption-edge singularity induced by many-body Coulomb effect is observed for the concentration up to 4.8x10(19) cm(-3) at room temperature. Such edge singularity has been so far observed at temperatures less than 50 K in other semiconductors. The strong Coulomb interaction between electrons and holes inherent to ZnO may be related to the persistence of the edge singularity up to room-temperature.

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