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Optoelectronic control of spin dynamics at near-terahertz frequencies in magnetically doped quantum wells

R. C. Myers, K. C. Ku, X. Li, N. Samarth, and D. D. Awschalom
Phys. Rev. B 72, 041302(R) – Published 11 July 2005

Abstract

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 spd exchange overlap.

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  • Received 18 November 2004

DOI:https://doi.org/10.1103/PhysRevB.72.041302

©2005 American Physical Society

Authors & Affiliations

R. C. Myers1, K. C. Ku2, X. Li2, N. Samarth2, and D. D. Awschalom1

  • 1Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, USA
  • 2Department of Physics and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA

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Issue

Vol. 72, Iss. 4 — 15 July 2005

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