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Browse Prior Art Database

Atomic Switch with high Degree of Amplification

IP.com Disclosure Number: IPCOM000111197D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Bandara, U: AUTHOR [+4]

Abstract

A switch is proposed, which is comprised of a fullerene molecule, a super-conducting surface, and a super-conducting stylus. The surface and the stylus are set up in a tunnel-microscope-like arrangement, where the fullerene molecule can be moved between the stylus and the surface. The coherent length of the super-conducting surface is longer (say &xi.[2] &nearly. 2 to 3 nm) and that of the super-conducting stylus is shorter (say &xi.[1] &nearly. 0.2 to 0.3 nm). The size of the fullerene molecule, which is a normal conductor, is about 1 nm in diameter and its movement is caused by an electrical impulse introduced between the stylus and the surface. See the Figure which shows schematically the "ON" and "OFF" positions of the switch.

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Atomic Switch with high Degree of Amplification

      A switch is proposed, which is comprised of a fullerene
molecule, a super-conducting surface, and a super-conducting stylus.
The surface and the stylus are set up in a tunnel-microscope-like
arrangement, where the fullerene molecule can be moved between the
stylus and the surface.  The coherent length of the super-conducting
surface is longer (say &xi.[2]  &nearly.  2 to 3 nm) and that of the
super-conducting stylus is shorter (say &xi.[1] &nearly.  0.2 to 0.3
nm).  The size of the fullerene molecule, which is a normal
conductor, is about 1 nm in diameter and its movement is caused by an
electrical impulse introduced between the stylus and the surface.
See the Figure which shows schematically the "ON" and "OFF" positions
of the switch.

      In the "ON" position (Fig. 1a) of the arrangement shown in the
Figure, the fullerene molecule remains normal conducting and adjacent
to super-conductor SC2, because the penetration depth of 0.2 nm of
the corresponding cooper pairs are small.  On the other hand, at the

"OFF" position (Fig. 1b), the penetration is throughout the fullerene
molecule.  The molecule remains super-conducting and adjacent to the
"less" super-conducting stylus SC1.  As a consequence, the current
between stylus and surface due to tunnel effect is remarkable
different in levels between "ON" and "OFF" positions.  The difference
is expected to be much wider than in the state-of-the-art case wher...