2004/11/18 by R. C. Myers, Roberto C. Myers, K. C. Ku +5 · 2 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.72.041302
published as Phys. Rev. B 72, 041302(R) (2005) · 4 pages, 3 figures
arxiv created 2004/11/18 · openalex publication_date 2005/07/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We use time-resolved Kerr rotation to demonstrate optical and electronic tuning of both electronic and local moment (Mn2+) spin dynamics in electrically gated parabolic quantum wells derived from II-VI diluted magnetic semiconductors. By changing either the electrical bias or laser energy, the electron spin precession frequency is varied from 0.1 to 0.8 THz at a magnetic field of 3 T and at a temperature of 5 K. The corresponding range of electrically tuned effective electron g-factor is an order of magnitude larger compared with similar nonmagnetic III-V parabolic quantum wells. Additionally, we demonstrate that such structures allow electrical modulation of local moment dynamics in the solid state, which is manifested as changes in amplitude and lifetime of Mn2+ spin precession under electrical bias. The large variation of electron and Mn-ion spin dynamics is explained by changes in magnitude of the sp\text\ensuremath-d exchange overlap.