Combined piezoelectricity, valley splitting and Dzyaloshinskii–Moriya interaction in Janus GdXY (X, Y = Cl, Br, I) magnetic semiconductors

The Janus monolayer 2H-GdXY (X, Y = Cl, Br, I) combines both intrinsic valley splitting and strong Dzyaloshinskii–Moriya interaction (DMI), which can be greatly tuned by biaxial strain to obtain a skyrmions with expected size.