Ii. Kaya et al., SPATIAL EVOLUTION OF HOT-ELECTRON RELAXATION IN QUANTUM HALL CONDUCTORS, Physical review. B, Condensed matter, 58(12), 1998, pp. 7536-7539
We have analyzed the energy relaxation of hot electrons in the prebrea
kdown regime of the quantum Hall effect. Hot electrons, generated by a
periodic set of constrictions, are injected into two-dimensional elec
tron systems (2DES's) of various mobilities, with Hall fields below th
e breakdown value. The resistivity of the 2DES is measured as a functi
on of the distance from the injection front. The results are compared
with calculations on the basis of a nonequilibrium between the excitat
ion and relaxation of hot electrons. Energy relaxation lengths from 0.
3 to 3 mu m were deduced, which increase with the mobility and are com
parable to the mean free path. [S0163-1829(98)51936-4].