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