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Browse Prior Art Database

One-Dimensional Aharonov-Bohm Superlattice

IP.com Disclosure Number: IPCOM000035411D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Esaki, L: AUTHOR [+3]

Abstract

Disclosed is a novel device which exploits the interference of coherent electron waves. This device is quasi-one-dimensional superlattice comprising a narrow channel modulated by a series of punched holes or annuli. This device combines the effects of a periodic potential fluctuation with the Aharonov-Bohm effect.

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One-Dimensional Aharonov-Bohm Superlattice

Disclosed is a novel device which exploits the interference of coherent electron waves. This device is quasi-one-dimensional superlattice comprising a narrow channel modulated by a series of punched holes or annuli. This device combines the effects of a periodic potential fluctuation with the Aharonov-Bohm effect.

An example of the structure is shown in Fig. 1. The width of the channel, w, and the annuli diameter, d, are to be small enough that the channels defined for electron transport will support only a few quasi- one-dimensional quantum levels or modes. In addition, they must be small enough that the size of the superlattice is smaller than the electronic phase coherence length, or mean free path. To yield a clear superlattice effect, at least 10 annuli or superlattice periods should be included in the device. Based on the present state of the art, w and d can be 400 and 200 nm respectively if the device is fabricated in a GaAs-AlGaAs heterostructure. This is because the phase-coherence length can be several microns long in these structures. Finally, to tune or control the superlattice effects, a gate is deposited over the superlattice region.

The presence of annuli in the superlattice will produce novel magnetic field effects based on the Aharonov-Bohm effect. Interesting effects may arise from coupling of the superlattice periodicity and the magnetic interference effects. By adjusting the bias on the gate, these e...