Ballistic conduction
Ballistic conduction is the characteristic of a material, known as a ballistic conductor, which has crystalline properties that allow electrons to flow through the material without collisions. The material must be free of impurities that the electrons will be capable of colliding with. In ordinary conductors, flowing electrons continually collide with the atoms making up the material, slowing down the electrons and causing the material to heat, effectively creating resistance in the material. Ballistic conduction differs from superconductivity due to the absence of the Meissner effect in the material.
Ballistic conduction occurs in some carbon nanotubes.
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