Figure 4.

The tunneling time τn as the number of cellsn in a SL is varied. (a) Saturation of τn for electron energies E=0.15 eV and E=0.2 eV in the gap. (b) The energy is close to a resonant band-edge. In this case, more resonances appear as n is increased with the energy fixed. No Hartman effect can be inferred from this figure.

Simanjuntak and Pereyra Nanoscale Research Letters 2013 8:145   doi:10.1186/1556-276X-8-145
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