Abstract
Analytical expressions for the transmission coefficient and the resonance condition are derived for the first time for the asymmetrical rectangular double-barrier structures with deep well when a dc bias field is applied. It is found that the unity resonance of the resonant tunneling with unity transmission occurs when both the phase difference condition for resonance (PDCR) and the maximum condition for the peak value (MCPV) hold simultaneously, while the under-unity resonance occurs that the peak value of transmission coefficient at resonance is below unity if only PDCR holds. Wave functions of an electron at the resonance level are calculated and the confining phenomena are confirmed.
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