Negative submillimeter absorption in tunnel‐coupled quantum wells under resonant infrared excitation
作者:
F. T. Vasko,
Yu. N. Soldatenko,
期刊:
Applied Physics Letters
(AIP Available online 1995)
卷期:
Volume 66,
issue 5
页码: 544-546
ISSN:0003-6951
年代: 1995
DOI:10.1063/1.114007
出版商: AIP
数据来源: AIP
摘要:
We have studied the redistribution of the electrons between the tunnel‐coupled ground levels in double quantum wells (DQWs), caused by the resonant infrared (IR) excitation on the next level and relaxation of the photoexcited electrons due to spontaneous emission of the optical phonons. The condition for the inversion of the electron populations in the tunnel‐coupled pair of ground states is presented as a function of the DQWs parameters. Negative absorption coefficient of the submillimeter radiation under intensive (2–4 kW/cm2) IR pumping and commonly realized parameters of DQWs is of order 20–50 cm−1. ©1995 American Institute of Physics.
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