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 another on a conduction layer to cause transition of charges in {HEAD ~ the conduction layer} to {TAIL ~ the charge accumulation layer} by resonance tunneling 
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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 another on a conduction layer to cause transition of charges in { HEAD ~ the conduction layer } to { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH