Abstract
We have measured dispersions of spin-flip waves and spin-flip single-particle excitations of a spin-polarized two-dimensional electron gas in a Cd1-xMnx Te quantum well using resonant Raman scattering. We find the energy of the spin-flip wave to be below the spin-flip single-particle-excitation continuum. From this, we show that the theory of spin waves in diluted magnetic quantum wells is incomplete. Terms accounting for the Coulomb interaction between carriers must be included in the spin-wave propagator to match the experimental data. The dominant Coulomb contribution leads to an overall redshift of the mixed electron-Mn spin modes, while the dynamical coupling between Mn ions results in a small blueshift. We provide a simulated model system, which shows the reverse situation, but at an extremely large magnetic field.
Original language | English |
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Article number | 035323 |
Journal | Physical Review B |
Volume | 83 |
Issue number | 3 |
DOIs | |
Publication status | Published - 27 Jan 2011 |