EPR and ferromagnetism in diluted magnetic semiconductor quantum wells

Details EPR and ferromagnetism in diluted magnetic semiconductor quantum wells EPR and ferromagnetism in diluted magnetic semiconductor quantum wells

2003-06-25

arxiv.org/abs/cond-mat/0306635v2

Phys. Ref. Lett. 91, 077202 (2003)

Physics

Condensed Matter

Materials Science

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.91.077202

Motivated by recent measurements of electron paramagnetic resonance (EPR) spectra in modulation-doped CdMnTe quantum wells, [F.J. Teran {\it et al.}, Phys. Rev. Lett. {\bf 91}, 077201 (2003)], we develop a theory of collective spin excitations in quasi-two-dimensional diluted magnetic semiconductors (DMSs). Our theory explains the anomalously large Knight shift found in these experiments as a consequence of collective coupling between Mn-ion local moments and itinerant-electron spins. We use this theory to discuss the physics of ferromagnetism in (II,Mn)VI quantum wells, and to speculate on the temperature at which it is likely to be observed in n-type modulation doped systems.

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