Experimental nonsaturating velocity-field characteristic of GaAs

The equal areas rule method is used to determine the velocity-field characteristic (v = v(E)) from the experimental data measured on a GaAs sample when a high-field domain is in transit. The v = v(E) characteristic is close to that measured by Ruch and Kino for the electric fields below about 15 kV/cm and does not saturate for higher electric fields, which is in agreement with Heinle's theoretical analysis.