Electromagnetically induced transparency in a cascade-type quantum well subband system under intense picosecond excitation

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• 作者：S. Hanna^a ; B. Eichenberg^a ; D.A. Firsov^b ; L.E. Vorobjev^b ; V.M. Ustinov^c ; A. Seilmeier^a ;
• 关键词：Coherent effects ; EIT ; Intersubband transition ; Time resolved spectroscopy
• 刊名：Physica E: Low-dimensional Systems and Nanostructures
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：75
• 期：Complete
• 页码：93-96
• 全文大小：1097 K

文摘

The coherent light–matter interaction in a 4-level cascade-type subband system of an asymmetric GaAs/AlGaAs quantum well structure is studied in pump-probe transmission experiments with picosecond (ps) time resolution. Coupling two excited subbands by an intense mid-infrared laser pulse at low sample temperatures is found to result in a substantially increased transparency of the fundamental e₁–e₂ transition. We find a reduction of the absorption coefficient by ~80%, which is one of the most pronounced electromagnetically induced transparency in solid state systems observed so far.