What is the conductance quantum?
The conductance quantum is G_0 = 7.748091729e-5 S, exact by SI definition. It equals 2e^2/h.
Open the interactive PhysRef tool →Key facts
| Value | 7.748091729e-5 S |
|---|---|
| Symbol | G_0 |
| Relation | G_0 = 2e^2/h |
| Exactness | Exact by SI definition (uncertainty 0) |
| Source | CODATA 2018 |
Frequently asked questions
What is the value of the conductance quantum?
G_0 = 7.748091729e-5 S, the quantized unit of electrical conductance in ballistic conductors.
What is the conductance quantum used for?
It describes conductance steps in quantum point contacts and nanowires, each channel adding G_0.
How is G_0 related to the von Klitzing constant?
G_0 = 2/R_K, so the conductance quantum is the inverse of half the von Klitzing constant.
Related pages
Conductance quantum is part of PhysRef on GOAT Lab — a free reference you can use without signing up, and it works offline. Open the tool above for any custom value.
Part of GOAT Lab — 26 free, browser-based science, engineering and developer tools. No sign-up.