Direct measurement of resonant and nonresonant tunneling times in asymmetric coupled quantum wells
- 15 August 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 40 (5) , 3028-3031
- https://doi.org/10.1103/physrevb.40.3028
Abstract
We have directly measured the tunneling times in an asymmetric coupled double-quantum-well structure using subpicosecond luminescence spectroscopy. We 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.Keywords
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