In our original manuscript [1], we unfortunately used the wrong term “Langasite” in the abstract and in the introduction. However, Langasite is ${\mathrm{La}}_3{\mathrm{Ga}}_5{\mathrm{SiO}}_{14}$ and hence a different crystal than the ${\mathrm{LiGaS}}_2$ that was actually applied in our experiments. In order to avoid any confusion, the word “Langasite” should be removed entirely from the abstract and text. That is, in both occasions, “${\mathrm{LiGaS}}_2$ (Langasite, LGS)” should be changed to “${\mathrm{LiGaS}}_2$ (LGS)”. The rest of the manuscript and all results and conclusions are not affected by this change. We thank Marcus Seidel for pointing out the mistake.