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Possible evidence for Harper broadening in the yellow exciton series of Cu2O at ultrahigh magnetic fields
Zhuo Yang, Jinbo Wang, Yuto Ishii, Duncan K. Maude, Atsuhiko Miyata, Yasuhiro H. Matsuda
https://arxiv.org/abs/2510.00661

Possible evidence for Harper broadening in the yellow exciton series of Cu2O at ultrahigh magnetic fields
Hydrogen-like systems in ultra-high magnetic fields are of significant interest in interdisciplinary research. Previous studies have focused on the exciton wavefunction shrinkage under magnetic fields down to artificial crystal lattices (e.g., quantum wells, superlattices), where the effective mass approximation remains valid. However, further compression toward the natural crystal lattice scale remains experimentally challenging. In this study, we report magneto-absorption measurements on the …