Elusive Dzyaloshinskii-Moriya interaction in monolayer Fe3GeTe2

S.L. and A.M. thank G. Bihlmayer, S.Blugel, and A. T. Costa for useful discussions. This work was supported by the King Abdullah University of Science and Technology (KAUST) through the Office of Sponsored Research (OSR) (Grant No. OSR-2017-CRG6-3390). K.-W.K.acknowledges support from the KIST institutional program and the National Research Council of Science & Technology (NST) (Grant No. CAP-16-01-KIST).