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

Cynthia Aku-Leh, Florent Perez, Bernard Jusserand, David Richards, and Grzegorz Karczewski
Phys. Rev. B 83, 035323 – Published 27 January 2011

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 Cd1xMnxTe 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.

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  • Received 13 August 2010

DOI:https://doi.org/10.1103/PhysRevB.83.035323

© 2011 American Physical Society

Authors & Affiliations

Cynthia Aku-Leh1,2, Florent Perez1, Bernard Jusserand1, David Richards2, and Grzegorz Karczewski3

  • 1Institut des Nanosciences de Paris, UMR 7588, CNRS/Université Paris VI et VII, Campus Boucicaut, 140 rue de Lourmel, FR-75015 Paris, France
  • 2Department of Physics, King’s College London, Strand, London WC2R 2LS, United Kingdom
  • 3Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, PL-02-668 Warszawa, Poland

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Issue

Vol. 83, Iss. 3 — 1 January 2011

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