Tunneling induced transparency: Fano interference in intersubband transitions
作者:
H. Schmidt,
K. L. Campman,
A. C. Gossard,
A. Imamogˇlu,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 70,
issue 25
页码: 3455-3457
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.119199
出版商: AIP
数据来源: AIP
摘要:
We report the observation of tunneling induced transparency in asymmetric double quantum well structures. Resonant tunneling through a thin barrier is used to coherently couple the two upper states in a three level system of electronic subbands in a GaAs/AlGaAs structure. This creates Fano-type interferences for the collective intersubband excitations in the absorption from the ground state, analogous to electromagnetically induced transparency (EIT) in atomic systems. We observe a 50&percent; reduction in absorption between the subband resonances which can be explained by taking into account the coherent coupling of the upper states. We analyze the bias dependent absorption spectra and determine the relevant lifetime broadening and dephasing rates for the transitions. ©1997 American Institute of Physics.
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