Bound states in continuum in an electron waveguide
  It is shown that in a double-cavity, two-dimensional electron waveguide, the interplay between quasi-bound states of each cavity leads to the appearance of bound states in continuum for certain distances between the cavities. These bound states may be used to trap electrons in de-localized states distributed in both cavities. 
Kyungsun Na, Gonzalo Ordonez and Sungyun Kim