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Occupation Modulation of Higher Subbands in a Three-Barrier Tunneling Structure with a Magnetic Field |
| AN Long;TANG Yan;ZHENG Hou-Zhi;ZHANG Ji-Dong;TAN Ping-Heng;YANG Fu-Hua;JI Yang;CHEN Yuan-Zhen |
| National Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083 |
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| Cite this article: |
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AN Long, TANG Yan, ZHENG Hou-Zhi et al 2002 Chin. Phys. Lett. 19 1509-1512 |
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Abstract We verify that the magnetic suppression of intersubband LO or LA phonon scattering can give rise to a noticeable nonthermal occupation in higher-lying subbands. This is clearly determined by the relative intensity ratio of the interband photoluminescence spectra for the E2-HH1 and E1-HH1 transitions. The observed phenomenon may provide an effective method to control the intersubband scattering rate, which is a key factor of the so-called quantum cascade lasers. This is helpful for the population inversion between both the subbands in quantum wells.
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| Keywords:
73.40.Gk
78.66.Fd
41.20.-q
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Published: 01 October 2002
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