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In a bid to simultaneous explanation of dark matter (DM) and tiny butnon-zero masses of left-handed neutrinos, we propose a minimal extension of theStandard Model (SM) by a vector-like fermion doublet and three right handed(RH) singlet neutrinos. The DM arises as a mixture of the neutral component ofthe fermion doublet and one of the RH neutrinos, both assumed to be odd underan additional $\mathcal{Z}_2$ symmetry. As a result, the DM emerges to be adominantly Majorana particle and escapes from $Z$-mediated direct searchconstraints to mark a significant difference from singlet-doublet Dirac DM. Theother two $\mathcal{Z}_2$ even heavy RH neutrinos give rise masses and mixingof light neutrinos via Type-I Seesaw mechanism. The particle contentautomatically allows us to extend the model by a gauged $U(1)_{B-L}$ symmetry,which is anomaly free and brings an additional portal between DM and SMparticles. Relic density and direct search allowed parameter space for both thecases are investigated through detailed numerical scan, while collider searchstrategies are also indicated.

Singlet-Doublet Majorana Dark Matter and Neutrino Mass in a minimal Type-I Seesaw Scenario