Nanofabricated device for multiple-state logic operation

Details Nanofabricated device for multiple-state logic operation Nanofabricated device for multiple-state logic operation

1994-05-27

1996-01-16

Saadat, Mahshid

Active solid-state devices (e.g., transistors, solid-state diode

Thin active physical layer which is

Heterojunction

257 14, 257 21, 257187, 257192, H01L 2906, H01L 310328, H01L 310336

Patent

active

054850185

ABSTRACT:
A nanofabricated logic device, operable at multiple (more than two) logic levels comprises asymmetrically coupled quantum point contacts provided with respective sources and drains and a coupling region between gate electrodes. The quantum mechanical carrier wavefunction in the region of QPC1, 2 is spatially asmmetric with alternate quantised energy levels lying either in QPC1, or QPC2, so that by changing the energy level, the conductance of the device can be switched between multiple stable conductance levels. The device can be used to provide a multilevel output switched in response to terahertz pulses provided by an array of optical detectors.

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Eisenstein et al, "Independently Contacted 2-Dimensional Electron Systems in Double Quantum Wells," Appl. Phys. Lett., vol. 57, No. 22, 26 Nov. 1990, pp. 2324-2326.
High-Speed Semiconductor Devices, ed. S. M. Sze, by F. Capasso et al. (John Wiley & Sons, New York 1990): Quantum Effect Devices, Chap. 8, pp. 465-520.

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