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Caption : fig. s1: (a-f) 2d janus msigez4 (m=cr, w; z=n, p, as) energy band diagrams without considering soc.

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Caption : fig. s2: plot of total and local density of states for 2d wsigez4 (z=n, p, as).

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Caption : fig. s3: atomic orbital projection of 2d wsigez4 (z=n, p, as).

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Caption : fig. s4: energy band diagram of biaxial strain on 2d wsigen4 modulation.

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Caption : fig. s5: energy band diagram of biaxial strain on 2d wsigep4 modulation.

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Caption : fig. s6: energy band diagram of biaxial strain on 2d wsigeas4 modulation.