Simple Modules over the Weyl Algebra

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Let $k$ be a field of characteristic zero and let $A_1=k\langle x,y| \, xy-yx=1 \rangle$ be the Weyl algebra. Is there a (more or less explicit) possibility of writing down all simple modules over $A_1$ (by which I mean all left $A_1$-modules that have no nontrivial left $A_1$-submodule)?