1999/08/31 by Jairo Sinova, S. M. Girvin, T. Jungwirth +2 · 2 citations
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.61.2749
published as Phys. Rev. B 61(4), 2749 (2000) · 6 pages, 4 figures
openalex publication_date 2000/01/15 · arxiv created 2000/02/14 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The low-energy charged excitations in quantum Hall ferromagnets are topological defects in the spin orientation known as Skyrmions. Recent experimental studies on nuclear magnetic resonance spectral line shapes in quantum well heterostructures show a transition from a motionally narrowed to a broader ``frozen'' line shape as the temperature is lowered at fixed filling factor. We present a Skyrmion diffusion model that describes the experimental observations qualitatively and shows a time scale of \ensuremath∼50 \ensuremathμs for the transport relaxation time of the Skyrmions. The transition is characterized by an intermediate time regime that we demonstrate is weakly sensitive to the dynamics of the charged spin texture excitations and the subband electronic wave functions within our model. We also show that the spectral line shape is very sensitive to the nuclear polarization profile along the z axis obtained through the optical pumping technique.