Recently, a research team led by Professor He Lin from the School of Physics and Astronomy at Beijing Normal University, in close collaboration with a team led by Professor Sun Qingfeng from the International Center for Quantum Materials at the School of Physics at Peking University, has achieved the intra-atomic orbital hybridization in the artificial atoms for the first time. The related research findings, titled "Orbital hybridization in graphene-based artificial atoms," were published online in Nature on February 26, 2025.

The abstract of the paper is as follows:

Intra-atomic orbital hybridization and interatomic bond formation are the two fundamental processes when real atoms are condensed to form matter1,2. Artificial atoms mimic real atoms by demonstrating discrete energy levels attributable to quantum confinement3,4,5,6,7,8. As such, they offer a solid-state analogue for simulating intra-atomic orbital hybridization and interatomic bond formation. Signatures of interatomic bond formation have been extensively observed in various artificial atoms9,10,11,12,13,14,15,16,17. However, direct evidence of the intra-atomic orbital hybridization in the artificial atoms remains to be experimentally demonstrated. Here we realize the orbital hybridization in artificial atoms by altering the shape of the artificial atoms. The anisotropy of the confining potential gives rise to the hybridization between quasibound states with different orbital quantum numbers within the artificial atom. These hybridized orbits are directly visualized in real space in our experiment and are well reproduced by both numerical calculations and analytical derivations. Our study opens an avenue for designing artificial matter that cannot be accessed on real atoms through experiments. Moreover, the results obtained inspire the progressive control of quantum states in diverse systems.

The source of the paper:

Y. Mao, H.-Y. Ren, X.-F. Zhou, H. Sheng, Y.-H. Xiao, Y.-C. Zhuang, Y.-N. Ren, L. He, Q.-F. Sun, “Orbital hybridization in graphene-based artificial atoms”. Nature (2025) https://doi.org/10.1038/s41586-025-08620-z