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We study scalar and fermionic crossing two-component dark matter (C2CDM)models with $ U(1)_X $ dark gauge symmetry. This $ U(1)_X $ gauge symmetry isbroken via the dark Higgs mechanism of a dark Higgs field $\Phi$ and the darkphoton becomes massive. On the other hand, the same dark Higgs field $\Phi$also serves as a bridge between each component of two DM sectors such that thedark flavor-changing neutral current (DFCNC) interaction between them isinduced. Moreover, the mass splitting between these two DM sectors is generatedafter $ U(1)_X $ gauge symmetry breaking by nonzero $\langle \Phi \rangle$. Wediscuss the stability of DM candidates and allowed parameter space from therelic density and other constraints in C2CDM models. Some novel signatures withdisplaced vertices at Belle II are studied. Finally, the possible explanationsof 511 keV $\gamma$-ray line and XENON1T excess in C2CDM models are discussed.

Crossing two-component dark matter models and implications for 511 keV $\gamma$-ray and XENON1T excesses