Coherence properties of shallow donors in ZnO

ORAL

Abstract

The donor system in ZnO is a promising potential qubit for spin-based quantum information processing. It has similar advantages as the well-studied phosphorus donors in Si, i.e. high homogeneity, long coherence time, and strong donor nucleus-electron interaction, with the additional advantage that ZnO donors are optically coupled to donor-bound excitons. Here we present optical measurements of the Ga donor electron spin T1, T2*, and T2. We find the longitudinal spin relaxation time T1 is inversely proportional to the external magnetic field with a relationship ~B-3.5. The longest T1 we measure is ~0.1 s at 2.5 T. Due to the B-3.5 relationship, we expect T1 will exceed 1 s at fields lower than 1 T. We measure a T2* of ~20 ns and a spin echo decoherence time T2 of ~30 μs, which may be limited by instantaneous diffusion due to the high donor concentration (~1017 cm-3) or the spectral diffusion due to flip-flop of the surrounding Zn67 nuclear spins (4.1% of natural Zn). We describe these experiments as well as present a path toward single Zn donor isolation and increased coherence times.

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Presenters

  • Xiayu Linpeng

    Department of Physics, University of Washington

Authors

  • Xiayu Linpeng

    Department of Physics, University of Washington

  • Maria Viitaniemi

    Department of Physics, University of Washington

  • Yusuke Kozuka

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), the University of Tokyo, Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), Univ. of Tokyo, Applied Physics, University of Tokyo

  • Cameron Johnson

    Department of Physics, University of Oregon

  • Joseph Falson

    Max Planck Institute for Solid State Research

  • Atsushi Tsukazaki

    Institute for Materials Reaserch, Tohoku University, Tohoku Univ, Institute for Materials Research, Tohoku University, IMR, Tohoku University, Institute for Materials Research, Tohoku University, Tohoku Univ.

  • Masashi Kawasaki

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), the University of Tokyo, Univ of Tokyo, The University of Tokyo, Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), Univ. of Tokyo, Applied Physics, University of Tokyo, Department of Applied Physics, The University of Tokyo, Department of Applied Physics, University of Tokyo

  • Kai-Mei Fu

    Department of Physics and Department of Electrical Engineering, University of Washington, University of Washington