Figure 4: g-factor anisotropy and fit parameters.
From: Quadrupolar and anisotropy effects on dephasing in two-electron spin qubits in GaAs
(a) Due to an anisotropic g-tensor electron and nuclear spins have different quantization axes, Beff and Bext, respectively. This leads to a linear contribution of the transverse Overhauser field to the electronic Zeeman splitting, oscillating with the Larmor frequencies of the nuclear spins. (b,c) Fit parameters extracted for different in-plane magnetic field directions θ. The quadrupolar contribution to nuclear broadening δBα=ħδωQ,α/γα, expressed in terms of an equivalent linewidth for the three isotopes using equation (1), vanishes at 45° along the [100] direction. At the same angle, the sin(2θ) dependence of the coupling g⊥ with the transverse hyperfine field reaches a maximum.
