The shape complexity of hydrogenic impurity state in the Ga1 − χAlχN semiconductor quantum well Xue Liu, De-hua Wang, Xin-Yu Xie, Bin-hua Chu, Shu-fang Zhang and Gang Zhao Eur. Phys. J. D, 78 1 (2024) 4 Published online: 15 January 2024 DOI: 10.1140/epjd/s10053-023-00790-7