A barrier layer, a transition layer, a barrier layer, a transition layer, a barrier layer, a charge accumulation layer and a barrier layer are stacked one after {HEAD ~ another} on a conduction layer to cause transition of charges in {TAIL ~ the conduction layer} to the charge accumulation layer by resonance tunneling 
A barrier layer , a transition layer , a barrier layer , a transition layer , a barrier layer , a charge accumulation layer and a barrier layer are stacked one after { HEAD ~ another } on a conduction layer to cause transition of charges in { TAIL ~ the conduction layer } to the charge accumulation layer by resonance tunneling
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH