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The Kitaev model is a remarkable spin model with gapped and gapless spinliquid phases, which are potentially realized in iridates and$\alpha$-RuCl$_3$. In the recent experiment of $\alpha$-RuCl$_3$, the signatureof a nematic transition to the gapped toric code phase, which breaks the $C_3$symmetry of the system, has been observed through the angle dependence of theheat capacity. We here propose a mechanism by which the nematic transition canbe detected electrically. This is seemingly impossible because$J_\textrm{eff}=1/2$ spins do not have an electric quadrupole moment (EQM).However, in the second-order perturbation the virtual state with a nonzero EQMappears, which makes the nematic order parameter detectable by nuclear magneticresonance and M\"ossbauer spectroscopy. The purely magnetic origin of EQM isdifferent from conventional electronic nematic phases, allowing the directdetection of the realization of Kitaev's toric error-correction code.

Electric probe for the toric code phase in Kitaev materials through the hyperfine interaction