Electron transport through the X valley of GaAs/AlAs triple-barrier structures (TBS) grown by molecular-beam epitaxy has been studied. Negative differential resistance is observed at 77 K in one type of TBS and is identified as the result of electron transport through both the Γ and X valleys of TBS. In another type of TBS, resonant tunneling through the X valley of GaAs/AlAs TBS is observed. The Γ and X energy-band profiles under bias have been calculated in order to identify the observed features.
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Cheng et al. (1989) studied this question.
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