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Publication # 112

G. Livescu, A. M. Fox, D. A. B. Miller, T. Sizer, and W. H. Knox, "Resonantly Enhanced Electron Tunneling Rates in Quantum Wells," Phys. Rev. Lett., 63, 438-441, (1989).

Resonant tunneling of electrons in GaAs/AlGaAs quantum wells is resolved by picosecond pump-and-probe electroabsorption measurements. The temperature-independent tunneling escape times are dramatically affected by the applied electric field, with a pronounced minimum at the field corresponding to the resonance between the n=1 electron level in one quantum well, and the n=2 electron level in the adjacent one. The calculated field dependence of the tunneling times is in qualitative agreement with the data

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