Resonant reflection of an edge chan

Resonant reflection of an edge channel can occur in addition to the resonant transmission already considered Aharonov-Bohm oscillations due to interference of the reflections at the entrance and exit of a point contact, illustrated in Fig. 103, are one example of resonant reflection.292 Jain498 has considered resonant reflection via a localized state circulating around a potential maximum, as in Fig. 106b. Such a maximum may result naturally from a repulsive scatterer or artificially in a ring geometry (cf. Fig. 100). Tunneling of an edge state at each of the channel boundaries through the localized state occurs with probabilities TA and TB. The reflection probability of the edge channel is still given by TAB in Eq. (4.24), but the channel conductance GC is now a decreasing function of TAB, according to