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After examining the Feynman diagrams corresponding to the $\bar D^{(*)}\Sigma_c^{(*)}$, $\bar D^{(*)} \Lambda_c$, $D^{(*)} \bar K^{*}$, and $D^{(*)}\bar D^{(*)}$ hadronic molecular states, we propose a possible bindingmechanism induced by shared light quarks. This mechanism is similar to thecovalent bond in chemical molecules induced by shared electrons. We use themethod of QCD sum rules to calculate its corresponding light-quark-exchangediagrams, and the obtained results indicate a model-independent hypothesis: thelight-quark-exchange interaction is attractive when the shared light quarks aretotally antisymmetric so that obey the Pauli principle. We build a toy modelwith four parameters to formulize this picture, and estimate binding energiesof some possibly-existing covalent hadronic molecules. A unique feature of thispicture is that binding energies of the $(I)J^P = (0)1^+$ $D\bar B^*/D^* \barB$ hadronic molecules are much larger than those of the $(I)J^P = (0)1^+$$DD^*/\bar B \bar B^*$ ones, while the $(I)J^P = (1/2)1/2^+$ $\bar D\Sigma_c/\bar D \Sigma_b/B \Sigma_c/B \Sigma_b$ hadronic molecules have similarbinding energies.

Covalent hadronic molecules induced by shared light quarks