Electronic subband studies in In0.52Al0.48As/InxGa1−xAs one‐side‐modulation‐doped asymmetric coupled double quantum wells
作者:
T. W. Kim,
M. Jung,
T. H. Park,
Keon‐Ho Yoo,
Kyung‐Hwa Yoo,
G. Ihm,
期刊:
Applied Physics Letters
(AIP Available online 1995)
卷期:
Volume 66,
issue 4
页码: 508-510
ISSN:0003-6951
年代: 1995
DOI:10.1063/1.114072
出版商: AIP
数据来源: AIP
摘要:
Shubnikov–de Haas (SdH) and van der Pauw Hall effect measurements on In0.52Al0.48As/InxGa1−xAs coupled double quantum wells grown by metalorganic chemical vapor deposition have been carried out to investigate the magnetotransport properties of an electron gas and to determine the subband energies and wave functions in the coupled quantum wells. Transmission electron microscopy measurements showed that In0.8Ga0.2As and In0.53Ga0.47As quantum wells were separated by an In0.25Ga0.75As potential barrier in an active region. The SdH measurements at 1.5 K demonstrated clearly the existence of a quasi‐two‐dimensional electron gas in the quantum wells. The fast Fourier transformation results for the SdH data clearly indicate the occupation of three subbands in the In0.52Al0.48As/InxGa1−xAs coupled quantum wells. Electron subband energies and wave functions in the quantum wells were calculated by a self‐consistent method taking into account exchange‐correlation effects. The first and second excited subband wave functions in the asymmetric quantum well are strongly coupled over both In0.8Ga0.2As and In0.53Ga0.47As wells. ©1995 American Institute of Physics.
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