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We extend some two Higgs doublet models, where the Yukawa couplings for thecharged fermion mass generation only involve one Higgs doublet, by two singletscalars respectively carrying a singly electric charge and a doubly electriccharge. The doublet and singlet scalars together can mediate a two-loop diagramto generate a tiny Majorana mass matrix of the standard model neutrinos.Remarkably, the structure of the neutrino mass matrix is fully determined bythe symmetric Yukawa couplings of the doubly charged scalar to the right-handedleptons. Meanwhile, a one-loop induced neutrinoless double beta decay canarrive at a testable level even if the electron neutrino has an extremely smallMajorana mass. We also study other experimental constraints and implicationsincluding some rare processes and Higgs phenomenology.

Extending two Higgs doublet models for two-loop neutrino mass generation and one-loop neutrinoless double beta decay