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Tunnelling-Induced Transient Gain in an Asymmetric Double Quantum Well |
| XU Wei-Hua;WU Jin-Hui;GAO Jin-Yue |
| College of Physics, Jilin University, Changchun 130023
Key Laboratory of Coherent Light, Atomic and Molecular Spectroscopy (Ministry of Education), Jilin University, Changchun 130023 |
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| Cite this article: |
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XU Wei-Hua, WU Jin-Hui, GAO Jin-Yue 2004 Chin. Phys. Lett. 21 849-852 |
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Abstract We investigate the transient behaviour of a weak probe in asymmetric double quantum well structures, where two excited states are coupled by resonant tunnelling through a thin barrier in a three-level system of electronic subbands. There is no external coherent coupling field applied, and we find that probe gain can be achieved during the transient process, which is induced by the coherent coupling of the upper states via the resonant tunnelling. We show that the transient behaviour of the probe depends on the coupling strength and the dephasing rate and can be tuned by changing the width of the tunnelling barrier.
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| Keywords:
42.50.Gy
42.50.Hz
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Published: 01 May 2004
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| PACS: |
42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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