Conductance quantum

The conductance quantum (G₀) is the quantized unit of conductance. It is defined as G₀ = 2e²/h = 7.7480917346(25)×10⁻⁵ Ω⁻¹ ≈ ¹⁄₁₂₉₀₀ Ω⁻¹.^[1] It appears when measuring the conductance of a quantum point contact.

The name conductance quantum is somewhat misleading, since it implies that there can only be conductances that are integer multiples of G₀. This is not the case, instead conductance quantum means the conductance of one conductance channel, if the probability of an electron entering this channel being transmitted is unity. If this probability is not unity, there must be a correction for the particular conductance channel.^{[citation needed]}

References

1. ^ Barry N. Taylor, Peter J. Mohr (2010). "CODATA Value: Conductance Quantum". The NIST Reference on Constants, Units, and Uncertainty. National Institute of Standards and Technology. http://physics.nist.gov/cgi-bin/cuu/Value?conqu2e2sh. Retrieved 2011-06-23.