Electron Spin Dephasing and Optical Pumping of Nuclear Spins in GaN

G. Wang; C. R. Zhu; B. L. Liu; H. Ye; A. Balocchi; T. Amand; B. Urbaszek; H. Yang; X. Marie

doi:10.1103/PhysRevB.90.121202

Electron Spin Dephasing and Optical Pumping of Nuclear Spins in GaN

Mesoscale and Nanoscale Physics 2015-06-22 v1

Authors: G. Wang , C. R. Zhu , B. L. Liu , H. Ye , A. Balocchi , T. Amand , B. Urbaszek , H. Yang , X. Marie

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Abstract

We have measured the donor-bound electron spin dynamics in cubic GaN by time-resolved Kerr rotation experiments. The ensemble electron spin dephasing time in this quantum dot like system characterized by a Bohr radius of 2.5 nm is of the order of 1.5 ns as a result of the interaction with the fluctuating nuclear spins. It increases drastically when an external magnetic field as small as 10 mT is applied. We extract a dispersion of the nuclear hyperfine field {\delta}Bn $\sim$ 4 mT, in agreement with calculations. We also demonstrate for the first time in GaN based systems the optical pumping of nuclear spin yielding the build-up of a significant nuclear polarization.

Keywords

electron spin dephasing optical pumping nuclear spins GaN time-resolved Kerr rotation hyperfine field nuclear polarization

Cite

@article{arxiv.1407.5540,
  title  = {Electron Spin Dephasing and Optical Pumping of Nuclear Spins in GaN},
  author = {G. Wang and C. R. Zhu and B. L. Liu and H. Ye and A. Balocchi and T. Amand and B. Urbaszek and H. Yang and X. Marie},
  journal= {arXiv preprint arXiv:1407.5540},
  year   = {2015}
}

Electron Spin Dephasing and Optical Pumping of Nuclear Spins in GaN

Abstract

Keywords

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