HAADF-STEM images of (a) , (b) , and (c) Er-doped samples taken along the  zone axis. The nanoparticles are loosely circled for easy identification. The lowest concentration at which nanoparticles could be identified was .
(Color online) Infrared absorption coefficient measured at room temperature. The intensity of the plasmon absorption peak at increases with increasing Er concentration. A scan from undoped on InP is subtracted as a baseline.
Room temperature Hall effect measurements on Er-doped . The shaded area indicates the concentration limit at which nanoparticles form for the given MBE growth conditions.
(Color online) Temperature dependent (a) carrier mobility, (b) carrier density, and (c) conductivity, as measured by the Hall effect.
(Color online) Natural log of the carrier density vs reciprocal temperature for Er-doped MBE-grown thin films with and without ErAs nanoparticles. The activation energy is calculated using the linear slope of the curves below 200 K.
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