1999/12/06 by K. V. Kavokin, Kirill Kavokin, Kavokin, Kirill
Physics and Astronomy · #Atomic and Subatomic Physics Research #Condensed Matter (cond-mat) #FOS: Physical sciences #NMR spectroscopy and applications #Quantum optics and atomic interactions #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/9912084
Presented at NATO Advanced Research Workshop "Optical properties of semiconductor nanostructures" Ustron-Jaszowiec, Poland, June 12-16, 1999
arxiv created 1999/12/06 · openalex publication_date 1999/12/06 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Spins of charge carriers, paramagnetic centers, and nuclei in semiconductor structures are known to be oriented if circular-polarized light is shined upon the structure. This is due to transfer of angular momentum from photons to various excitations in the semiconductor. What would happen if the structure is anisotropic, so that the angular momentum is not conserved? Experiments performed on diluted-magnetic II-VI quantum wells (such as CdMnTe/CdMgTe) show that at some conditions the effect of light upon the spin state of the semiconductor structure can be greatly amplified. Exchange field of photoexcited heavy holes initiates a coherent evolution of a great number of localized spins of Mn-ions. In the simplest case, it is just a precession in an effective field, but generally the spin dynamics is more intricate. It shows up, for instance, in long sequences of spin-flip peaks in Raman spectra, in enhanced magnetic-polaron effect, and in modulation of optical response within the picosecond time scale.