Crystal Structure of Localized Quantum Unipotent Coordinate Category

A localized quantum unipotent coordinate category $\widetilde{{\mathcal{C}}_w}$ associated with a Weyl group element $w$ is a rigid monoidal category which is obtained by applying the localization process to a subcategory of the category of finite-dimensional graded modules of a quiver Hecke algebra. We shall show that the family of the isomorphism classes (up to grading shifts) of simple objects in $\widetilde{{\mathcal{C}}_w}$ possesses a crystal structure and it is isomorphic to the cellular crystal associated with $w$. As an application of this result, we shall show the connectedness of the crystal graph of an arbitrary cellular crystal.