In the conduction layer, one insulation portion and {HEAD ~ one insulation portion} allowing {TAIL ~ charge tunneling} are formed with the barrier layer in between 
In the conduction layer , one insulation portion and { HEAD ~ one insulation portion } allowing { TAIL ~ charge tunneling } are formed with the barrier layer in between
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH