Barrier Breakdown in a Multiple Quantum Well Structure
Résumé
We explore a regime of unipolar electronic transport in a multiple quantum well structure with very large current discontinuities - up to five orders of magnitude. Magnetotransport experiments reveal different transport regimes. Quantum well impact ionization shifts the structure from a resistive “down” state, where the current flows through interwell quantum tunneling, to a highly conductive “up” state. In the latter regime, the current leaks through a barrier suddenly broken down because of an efficient ionization of the first quantum well.
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