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