Abstract
The short pulsed, tunable output from the Dutch free electron laser FELIX, coupled with a 45
T pulsed magnet has been used to measure the non-radiative decay rates between Landau levels in n-type InAs/GaSb quantum wells. The decay rate is 2
ps
−1 when the cyclotron resonance energy,
E
CR=
E
LO=30
meV, and only slightly less, 0.8
ps
−1 when
E
CR=2
E
LO when the principal relaxation pathway is the emission of multiple longitudinal optical (LO) phonons.