Abstract
The energy relaxation of hot electrons in Hg0.8Cd0.2Te at 1.5 K is studied theoretically in the extreme magnetic quantum limit. The calculation includes band nonparabolicity, free-carrier screening, nonequipartition of acoustic phonons, and Landau level broadening due to electron-impurity interactions. It is shown that the nonequilibrium acoustic phonons have to be included to explain the experimental values of the energy relaxation time. The phonon lifetime is found to lie in the range 32 to 112 ns.
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