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