Dynamical corrections to spin-wave excitations in quantum wells due to Coulomb interactions and magnetic ions - Archive ouverte HAL
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2011

Dynamical corrections to spin-wave excitations in quantum wells due to Coulomb interactions and magnetic ions

Résumé

We have measured dispersions of spin-flip waves and spin-flip single-particle excitations of a spin-polarized two-dimensional electron gas in a Cd(1-x)Mn(x) 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.

Dates et versions

hal-01229199 , version 1 (16-11-2015)

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Citer

Cynthia Aku-Leh, Florent Perez, Bernard Jusserand, David Richards, Grzegorz Karczewski. Dynamical corrections to spin-wave excitations in quantum wells due to Coulomb interactions and magnetic ions. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 83 (3), pp.035323. ⟨10.1103/PhysRevB.83.035323⟩. ⟨hal-01229199⟩
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