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Comment: Bilayer graphene can do this (Score 1) 81

by Ramble (#34964588) Attached to: Graphene Won't Replace Silicon In CPUs, Says IBM
This is wrong and right - a single layer of graphene has no gap and one can only be produced if it lies on an appropriate substrate (one that introduces an energy difference between the two different basis point within the graphene lattice). However bilayer graphene exerts a tunable band gap with the application of an electric field - essentially the conductive state is gate controlled, the problem at the moment is the on/off ratio which is being hampered by a number of things including the cleanness of the graphene and the size of the electric field you can apply. I can assure you it's very possible to make transistors from graphene - I've done it.

Comment: Re:And For The Record... (Score 1) 672

by Ramble (#34884694) Attached to: Bastardi's Wager
An engineer spends years at university learning how to build a bridge, he learns every detail from the behaviour of concrete to load bearing of steel, in the end he gets his degree and builds bridges. A physicist spends years at university learning how to learn, in the end it only takes a small effort for him to learn bridge building.

Comment: Re:"Too fast to be true" (Score 1) 194

by Ramble (#34524106) Attached to: SHA-3 Finalist Candidates Known
Actually it is - if you have a fast hash algorithm it means attackers can easily hash a whole database, for example if they found a weakness in your system (e.g. you used the same salt for all your passwords) then he could very easily rehash his dictionary attacks with this new salt with a trivial amount of computing time.

Comment: Single Atoms? (Score 3, Interesting) 142

by Ramble (#34252774) Attached to: Graphene Can Be Made With Table Sugar
Single atom transistors? Where are they getting this from? I do work with graphene and to introduce a bandgap (either in single or multilayer sheets) you need to introduce an energy difference between atoms - in the case of a single sheet you do that by using a substrate with a similar structure (e.g. Boron nitride) so the two basis atoms of graphene experience different energies or in the case of multiple sheets you can use an electric field ala FETs. In no way could you do this with a single atom as graphene has no band gap and is thus a metal normally.

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