Quantum device output switch

Details Quantum device output switch Quantum device output switch

1986-04-04

1989-01-17

Larkins, William D.

357 4, 357 16, 357 6, 357 34, H01L 29225, H01L 2976, H01L 2988

Patent

active

047990910

ABSTRACT:
Quantum-coupled devices, wherein at least two closely adjacent potential wells, (e.g. islands of GaAs in an AlGaAs lattice) are made small enough that the energy levels of carriers within the wells are discretely quantized. This means that, when the bias between the wells is adjusted to align energy levels of the two wells, tunneling will occur very rapidly, whereas when energy levels are not aligned, tunneling will be greatly reduced. To provide output coupling from these quantum-well devices to macroscopic currents, the output from the quantum-well devices is injected into localized states close to an extremely small metal line (e.g. 200 Angstroms square in section). These trapped charged perturb the resistance of a metal line significantly, so that a conventional sense amplifier can be used for differential sensing between two such narrow metal lines, to provide macroscopic outputs.

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Lehwol et al., J. Appl. Phys., vol. 41, 2664, (1970).
Vojak et al., J. Appl. Physics, vol. 50, 5030-5045, (1979).
Rauls et al., Phys. Rev. Letters, vol. 52, 228, (1984).

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