Investigation into the interface formed between Sb2Te3/Ni80Fe20 heterostructures – this is studied using temperature dependent magnetometry, scanning transmission electron microscopy, ferromagnetic resonance, and theoretical support.
The spin state of holes bound to Mn acceptors in GaMnAs is investigated by optical spectroscopy. Concentrations of Mn from 1017 to 1019 cm-3 were studied as a function of magnetic field and temperature. The photoluminescence from recombination of electrons with holes bound in the Mn-acceptor complex (MAC) displays multiple spectral peaks. The circular polarization of these peaks increases with increasing magnetic field and saturates at ρ ≈ 1/3. This value of polarization is expected from modeling the addition of spin angular momentum and interband optical transition matrix elements.
We present a review of our recent resonant inelastic light scattering research of the ultra-high
mobility two-dimensional electron gas in GaAs quantum wells. Spectroscopy of intersubband
excitations shows that exchange interactions are larger than previously anticipated. Light scattering
by large wavevector inter-Landau-level excitations displays the excitonic binding and roton minima
in the mode dispersions that are predicted by Hartree-Fock theories.
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