Single Particle and Collective Spin Excitations in Semimagnetic Quantum Wells

• Authors: F. Perez , B. Jusserand , D. Richards , G. Karczewski
• Languages of publication: EN

Abstracts

EN

Collective and single-particle spin-flip excitations of a two-dimensional electron gas in a semimagnetic Cd_{1-x}Mn_xTe quantum well are observed by resonant Raman scattering. Application of a magnetic field splits the spin-subbands and a spin-polarization is induced in the electron gas. Above some critical field, a collective spin-flip mode, which disperses with in-plane wave vector, dominates the spectra. The energy of this mode is given by the bare Zeeman energy at vanishing wave vector as predicted by Larmor's theorem and its in-plane dispersion is well described by a model of the interacting polarizability of a spin polarized electron gas when both exchange and correlation are taken into account.

Keywords

EN

72.25.Dc; 73.21.-b; 75.70.-i; 78.30.-j

Discipline

• 75.70.-i: Magnetic properties of thin films, surfaces, and interfaces(for magnetic properties of nanostructures, see 75.75.-c)
• 72.25.Dc: Spin polarized transport in semiconductors
• 78.30.-j: Infrared and Raman spectra(for vibrational states in crystals and disordered systems, see 63.20.-e and 63.50.-x, respectively; for Raman spectra of superconductors, see 74.25.nd)
• 73.21.-b: Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems(for electron states in nanoscale materials, see 73.22.-f)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 106
• Issue: 3
• Pages: 311-317

Dates

published

2004-09

received

2004-06-10

Contributors

author

F. Perez

• CNRS/LPN, Route de Nozay, 91460 Marcoussis, France

author

B. Jusserand

• CNRS/LPN, Route de Nozay, 91460 Marcoussis, France

author

D. Richards

• Dept. of Physics, Kings College London, Strand, London WC2R 2LS, UK

author

G. Karczewski

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.106.311