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- W936705861 abstract "Resonant tunneling in artificially grown double-barrier resonant tunneling structures (DBTRS) has drawn much attention in recent years because of a promising possibility of its applications in high-frequency devices. It las been generally believed that tunneling is the fastest mechanism of electron transport in heterostructures. Indeed, Sollner et al. [1, 2] showed that AlGaAs-based DBRTS's grown by molecular beam epitaxy could oscillate at a frequency of 600 GHz and detect far infrared radiation at a frequency of 2.5 THz. These results gave rise to many debates as they seemed to be in conflict with the originally assumed Fabry-Perot (coherent) mechanism for resonant tunneling [3]. Indeed, a considerable storage time is needed to built up a steady-state probability amplitude in the quantum well which is a necessary condition for the resonance. Equivalently, this is the time spent by an electron in the quantum well where it bounces back and forth between the two barriers. It has been usually assumed that the storage time gives the fundamental speed limit in the DBRTS devices. Its value depends essentially on parameters of the stucture but usually falls within the picosecond range. Luryi [4] estimated it for some investigated structure to be 40 ps, which is about three orders of magnitude too long to give an account for the extreme frequencies reported in the literature. Therefore, Luryi has proposed an alternative explanation for the negative differential resistivity (NDR) in DBRTS, according to which an electron sequentially tunnels into the well and escapes by tunneling through the second barrier. In this case the origin of NDR would be conceptually similar to that in the Esaki diode. It was next demonstrated by Weil and Vinter [5] that the two proposed mechanisms lead, in fact, to the same predictions for the dc current. These authors" @default.
- W936705861 created "2016-06-24" @default.
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- W936705861 date "1993-09-01" @default.
- W936705861 modified "2023-10-18" @default.
- W936705861 title "Traversal Time through Double-Barrier Resonant Tunneling Structure" @default.
- W936705861 doi "https://doi.org/10.12693/aphyspola.84.587" @default.
- W936705861 hasPublicationYear "1993" @default.
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