  The realization of magnetic skyrmions in two-dimensional (2D) magnets holds
great promise for both fundamental research and device applications. Despite
recent progress, two-dimensional skyrmion hosts are still limited, due to the
fact that most 2D magnets are centrosymmetric and thus lack
Dzyaloshinskii-Moriya interaction (DMI). We show here, using a general analysis
based on symmetry, that Bloch-type skyrmions can, in fact, be stabilized in 2D
magnets, due to the interplay between in-plane component (dx) of second
nearest-neighbor DMI and magnetic anisotropy. Its validity is demonstrated in
the Cr2Ge2Te6 monolayer, which is also verified by recent experiments. Our work
gives a clear direction for experimental studies of 2D magnetic materials to
stabilize skyrmions and should greatly enrich the research on magnetic
skyrmions in 2D lattices.
