Acyclic quantum cluster algebras via Hall algebras associated to cluster categories

Let $Q$ be a finite acyclic valued quiver. We establish an alternative cluster multiplication formula in the quantum cluster algebra associated with $Q$, which exhibits certain symmetries similar to 2-Calabi–Yau properties of cluster categories. Motivated by this formula, we introduce a Hall algebra $\mathcal{D}{\mathcal{H}}_{\mathrm{\Lambda }}^{cl}(\tilde{\mathcal{A}})$ via a certain quotient of a derived Hall subalgebra associated with $Q$, serving as an algebra counterpart to cluster categories of hereditary algebras. As our main result, we prove that the quantum cluster algebra associated with $Q$ is isomorphic to the exceptional subalgebra of $\mathcal{D}{\mathcal{H}}_{\mathrm{\Lambda }}^{cl}(\tilde{\mathcal{A}})$, namely, the subalgebra generated by exceptional objects. Furthermore, when $Q$ is of Dynkin type, the quantum cluster algebra is naturally isomorphic to $\mathcal{D}{\mathcal{H}}_{\mathrm{\Lambda }}^{cl}(\tilde{\mathcal{A}})$ itself. This establishes a Hall algebra realization for all acyclic quantum cluster algebras. As an application, we introduce the Hall subalgebra of $\mathcal{D}{\mathcal{H}}_{\mathrm{\Lambda }}^{cl}(\tilde{\mathcal{A}})$ generated by projectives, yielding a Hall algebra analogue of the lower bound quantum cluster algebras. Then we show that the standard monomials of quantum projective cluster variables form a basis of the quantum cluster algebras via Hall algebra approach. Moreover, we show that the Auslander–Reiten translation of cluster categories induces an algebra automorphism of $\mathcal{D}{\mathcal{H}}_{\mathrm{\Lambda }}^{cl}(\tilde{\mathcal{A}})$. Finally, we apply the BGP-reflections to $\mathcal{D}{\mathcal{H}}_{\mathrm{\Lambda }}^{cl}(\tilde{\mathcal{A}})$, and prove that the Hall algebra $\mathcal{D}{\mathcal{H}}_{\mathrm{\Lambda }}^{cl}(\tilde{\mathcal{A}})$ is invariant up to isomorphism under the mutations at sink vertices of $Q$.