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Publication # 118 |
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| D. Y. Oberli, J. Shah, T. C. Damen, C. W. Tu, T. Y. Chang,
D. A. B. Miller, J. E. Henry, R. F. Kopf, N. Sauer, and A. E. Digiovanni,
"Direct measurement of resonant and nonresonant tunneling times in asymmetric coupled
quantum wells" Phys. Rev. B., 40, 3028-3031, (1989). The authors have directly measured the tunneling times in an asymmetric coupled double-quantum-well structure using subpicosecond luminescence spectroscopy. They observe a strong dependence of the nonresonant tunneling times on the barrier thickness. The most striking feature of the data is a drastic reduction of the tunneling time and then a further increase as an applied electric field sweeps electron levels in the two wells through a resonance. The measured resonant tunneling time is considerably longer than the estimated coherent tunneling time |
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