Robust and Interpretable Adaptation of Equivariant Materials Foundation Models via Sparsity-promoting Fine-tuning - Cho, Youngwoo; Yi, Seunghoon; Yang, Wooil; Kang, Sungmo; Son, Young-Woo; Choo, Jaegul; Lee, Joonseok; Kim, Soo Kyung; Yoon, Hongkee (International Conference on Learning Representations, 2026)