Long-lived electron spin coherence in Ga-doped ZnO at room temperature

Electron spin dynamics are studied in Ga-doped ZnO single crystals by time-resolved Faraday and Kerr rotation spectroscopies. Long-lived coherence with two dephasing processes is discovered where the characteristic time up to 5.2 ns at room temperature. Through dependence measurements of laser wavelength temperature, room-temperature long-lived signal attributed localized electrons. The (relaxation) independent transverse (longitudinal) magnetic fields, indicating not resulting from g-factor inhomogeneity electron-nuclear hyperfine interaction. It reveals that originate types electrons, both which dominated anisotropic exchange Dzyaloshinskii-Moriya interaction between adjacent