Ohmic i.e. transparent contacts are most favorable for an optimized current flow in a FET. In order to derive the current-voltage (I-V) characteristics for a ballistic CNT FET, one can start with Planck's postulate, which relates the energy of the i-th state to its frequency: E i = h ν ν i = h 2 e 2 e T i = h 2 e I i