The formula for drift mobility (\( \mu \)) is given by:
\[
\mu = \frac{v_d}{E}
\]
Where:
- \( \mu \) is the drift mobility (in units of m²/V·s),
- \( v_d \) is the drift velocity (in meters per second, m/s),
- \( E \) is the electric field (in volts per meter, V/m).
Drift mobility represents how quickly charge carriers (like electrons or holes) move through a semiconductor or conductor when subjected to an electric field. It essentially tells you how efficiently charge carriers can move in response to the applied electric field.