Dynamic polarization of Mn spins coupled to vertical optical cavities

ORAL

Abstract

Single magnetic spins in semiconductors can exhibit long lifetimes and are electrically controllable due to coupling of their spin states with those of the host semiconductor. In particular, Mn ions doped into GaAs quantum wells have spin lifetimes $\sim$10 nanoseconds and can be optically manipulated in zero magnetic field\footnote{R. C. Myers, M. H. Mikkelsen, J.-M. Tang, A. C. Gossard, M. E. Flatt\'{e}, and D. D. Awschalom, \textit{ Nature Materials} \textbf{7}, 203 (2008).}. To study this system in the low density limit, we incorporate a distributed Bragg reflector optical cavity around the Mn containing wells, which enhances Mn luminescence and allows spatial isolation of a small number of Mn ions imaged using scanning micro-photoluminescence. In such structures, we observe unusually long Mn T$_{2}^{\ast}> 60$ ns. We discuss the effect of cavity coupling on spin dynamics Mn ions in the single ion limit.

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Authors

  • G. Calusine

    Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California

  • R.C. Myers

    Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California

  • D.D. Awschalom

    University of California, Santa Barbara, University of California Santa Barbara, UCSB, Dept. of Physics, University of California, Santa Barbara CA 93106, Department of Physics, University of California, Santa Barbara, California 93106, USA, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, CA 93106, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, 93106, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California