Detailed characterization of HgCdTe/CdTe multiple quantum wells
作者:
C. L. Cesar,
M. N. Islam,
R. D. Feldman,
R. F. Austin,
D. S. Chemla,
L. C. West,
A. E. DiGiovanni,
期刊:
Applied Physics Letters
(AIP Available online 1990)
卷期:
Volume 56,
issue 3
页码: 283-285
ISSN:0003-6951
年代: 1990
DOI:10.1063/1.102809
出版商: AIP
数据来源: AIP
摘要:
We present absorption measurements in HgCdTe/CdTe multiple quantum wells as a function of temperature, polarization, and well size in the 3–4 &mgr;m wavelength region. The energy levels are calculated using a model that includes band nonparabolicity. The spectra are fitted to a sum of continuous broadened steps including the two‐dimensional Sommerfeld enhancement factor. Polarization measurements confirm the assignment of heavy and light holes. The ratio between heavy and light hole absorption of 2.3/1 agrees well with theory. The fit of the linewidth with temperature shows a homogeneous linewidth of 4.6 meV times the density of longitudinal optical phonons and an inhomogeneous linewidth of 6.4 meV, which is similar to the alloy broadening in the bulk material.
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