A tunneling current across a thin wall of a narrow-wide-narrow (NWN) cavity region in an electron waveguide is calculated. A lead is attached to the cavity region at right angle through a thin tunneling barrier to drain the current. The transmission coefficient through the NWN waveguide shows successive dips due to resonances through quasibound states in the cavity region as the length of the cavity region or the Fermi energy of an incident electron is varied. The transmission coefficient leaking out the tunneling barrier shows peaks that line up with the dips in the forward transmission probability, demonstrating that a tunneling spectroscopy of the quasibound state levels is provided through sweeping the Fermi energy.
ASJC Scopus subject areas
- Physics and Astronomy(all)