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It has previously been shown that, at least for non-exceptional Kac{Moody Lie algebras, there is a close connection between Demazure crystals and tensor products of Kirillov{Reshetikhin crystals. In particular, certain Demazure crystals are isomorphic as classical crystals to tensor products of Kirillov{Reshetikhin crystals via a canonically chosen isomorphism. Here we show that this isomorphism intertwines the natural ane grading on Demazure crystals with a combinatorially dened energy function. As a consequence, we obtain a formula of the Demazure character in terms of the energy function, which has applications to Macdonald polynomials and q-deformed Whittaker functions.

Demazure Crystals, Kirillov-Reshetikhin Crystals, and the Energy Function