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We report results on the searches of weakly interacting massive particles(WIMPs) with sub-GeV masses ($m_{\chi}$) via WIMP-nucleus spin-independentscattering with Migdal effect incorporated. Analysis on time-integrated (TI)and annual modulation (AM) effects on CDEX-1B data are performed, with 737.1kg$\cdot$day exposure and 160 eVee threshold for TI analysis, and 1107.5kg$\cdot$day exposure and 250 eVee threshold for AM analysis. The sensitivewindows in $m_{\chi}$ are expanded by an order of magnitude to lower DM masseswith Migdal effect incorporated. New limits on $\sigma_{\chi N}^{\rm SI}$ at90\% confidence level are derived as $2\times$10$^{-32}\sim7\times$10$^{-35}$$\rm cm^2$ for TI analysis at $m_{\chi}\sim$ 50$-$180 MeV/$c^2$, and$3\times$10$^{-32}\sim9\times$10$^{-38}$ $\rm cm^2$ for AM analysis at$m_{\chi}\sim$75 MeV/$c^2-$3.0 GeV/$c^2$.

physical review letters

Constraints on Spin-Independent Nucleus Scattering with sub-GeV Weakly  Interacting Massive Particle Dark Matter from the CDEX-1B Experiment at the  China Jin-Ping Laboratory