Homogeneous Bases for Demazure Modules
We study the PBW filtration on the Demazure modules $V_{r_{\gamma}}(\lambda)$ associated to reflections $r_{\gamma}$ at positive roots in type $A_n$, long roots $\alpha_{i,\overline{i}}$ in type $C_n$, short roots $\alpha_{i,n}$ in type $B_n$ and the roots $\alpha_{i,\overline{n}}$ in type $D_n$. In each type, we construct a normal polytope labelling a basis for the associated graded space $\operatorname{gr} V_{r_{\gamma}}(\lambda)$ and prove that the annihilating ideal of $\operatorname{gr} V_{r_{\gamma}}(\lambda)$ is a monomial ideal.