Difference between revisions of "Non mechanical technology path"
m |
|||
| Line 1: | Line 1: | ||
| − | + | In advanced nanofactories electric systems will probably be used. | |
| + | Electric systems though can't yet be integrated into plans for nanofactories because of a lack | ||
| + | of a set of well understood near ideal components. (For more information see: Nanosystems Section 1.3.4.b No nanoelectronic devices.) | ||
| + | Please keep discussions about the application of electric systems for nanofactories on this page until this restriction is lifted. | ||
| + | |||
| + | == Diffeculties == | ||
| + | |||
| + | Molecular electronics in [[technology level I]] behave rather non digital (neither diode nor resistor behavior) | ||
| + | |||
| + | In small (or big and very cold) [[atomic precision|AP]] repetitive structures electrons move as Bloch-waves without being scattered. | ||
| + | One also speaks of ballistic electron movement because in the wave picture (sharp impulse, infinitely long wave in space) the electrons move like billiard balls. Electrons can become problems flowing around sharp conductor bends since they do not collide with each other but only with the conductors walls. | ||
| + | This is essentially the same effect as the limited gas conduction due to the [http://en.wikipedia.org/wiki/Free_molecular_flow free molecular flow] in vacuum systems. | ||
| + | At higher temperatures the unavoidable electron phonon scattering becomes stronger [Todo: check how much electrons can easier flow around bends then] | ||
| + | Very small conductors can constrain electrons so much that the electron wave function loose all their nodes in the directions normal to the conductor surfaces (lowest mode excitation - similar to the situation in an optical single mode wave guide) | ||
| + | This situation is called low dimensional electron gas [Todo: check wether tighter bends be made?] | ||
| + | |||
| + | == Some kinds of electronics == | ||
| + | |||
| + | Restricting oneself to pure hydrocarbons like the "direct approach" motivates one can use graphene ribbons, nanotubes or other graphitic/polyaromatic structures like graphene ribbons as conductors and semiconductors and vacuum (,air) or diamond as isolator. | ||
| + | |||
| + | Note that while pyrolythic graphite is a resistive material nanotubes can conduct current between one and two orders of magnitude better than copper. | ||
| + | Electronic properties may be heavily influenced by: | ||
| + | * Statically included (or dynamically applicable) high mechanical strain | ||
| + | * the borders of the graphitic structure - closed, hydrogen terminated, chucked between two slabs of diamond | ||
| + | |||
| + | electric contacts between parts moving relative to one another can be either made flexible for reciprocative movement | ||
| + | or via tunneling between two combs of graphitic sheets. For low resistance the contacts need to be way bigger than the conductors [Todo:quantify] | ||
| + | |||
| + | If one allows some nonmetals one can create diamond checkerboard doped with nitrogen very similar to todays nanoelectronics. | ||
| + | |||
| + | == Magnetism == | ||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
* magnetic carbon | * magnetic carbon | ||
* superconductivity | * superconductivity | ||
| − | |||
| − | |||
| − | + | == Quantum computation == | |
| − | + | * quantum computation [[reversible data processing]] | |
Revision as of 14:28, 29 January 2014
In advanced nanofactories electric systems will probably be used. Electric systems though can't yet be integrated into plans for nanofactories because of a lack of a set of well understood near ideal components. (For more information see: Nanosystems Section 1.3.4.b No nanoelectronic devices.) Please keep discussions about the application of electric systems for nanofactories on this page until this restriction is lifted.
Diffeculties
Molecular electronics in technology level I behave rather non digital (neither diode nor resistor behavior)
In small (or big and very cold) AP repetitive structures electrons move as Bloch-waves without being scattered. One also speaks of ballistic electron movement because in the wave picture (sharp impulse, infinitely long wave in space) the electrons move like billiard balls. Electrons can become problems flowing around sharp conductor bends since they do not collide with each other but only with the conductors walls. This is essentially the same effect as the limited gas conduction due to the free molecular flow in vacuum systems. At higher temperatures the unavoidable electron phonon scattering becomes stronger [Todo: check how much electrons can easier flow around bends then] Very small conductors can constrain electrons so much that the electron wave function loose all their nodes in the directions normal to the conductor surfaces (lowest mode excitation - similar to the situation in an optical single mode wave guide) This situation is called low dimensional electron gas [Todo: check wether tighter bends be made?]
Some kinds of electronics
Restricting oneself to pure hydrocarbons like the "direct approach" motivates one can use graphene ribbons, nanotubes or other graphitic/polyaromatic structures like graphene ribbons as conductors and semiconductors and vacuum (,air) or diamond as isolator.
Note that while pyrolythic graphite is a resistive material nanotubes can conduct current between one and two orders of magnitude better than copper. Electronic properties may be heavily influenced by:
- Statically included (or dynamically applicable) high mechanical strain
- the borders of the graphitic structure - closed, hydrogen terminated, chucked between two slabs of diamond
electric contacts between parts moving relative to one another can be either made flexible for reciprocative movement or via tunneling between two combs of graphitic sheets. For low resistance the contacts need to be way bigger than the conductors [Todo:quantify]
If one allows some nonmetals one can create diamond checkerboard doped with nitrogen very similar to todays nanoelectronics.
Magnetism
- magnetic carbon
- superconductivity
Quantum computation
- quantum computation reversible data processing
