Sharp Diffraction Pattern Produced by Atoms Passing Through Graphene
A beam of neutral atoms striking a material can produce a diffraction pattern that is sensitive to short-range interactions between the atoms and the surface. Building on recent developments, Pierre Guichard from the University of Strasbourg in France and colleagues from Strasbourg and from the Catholic University of Louvain in Belgium have now used a fast hydrogen beam to probe single-layer graphene, producing the sharpest graphene diffraction patterns to date [1].
Early atom diffraction experiments predominantly looked at reflection, because atoms transmitted through a material tend to lose their wave-like coherence. Recently, however, transmitted atoms were shown to produce a diffraction pattern from single-layer graphene [2]. The trick was to use fast atoms that traverse the target quickly, minimizing coherence-destroying interactions.
Guichard and colleagues performed a similar diffraction experiment (and submitted their report before the August publication of Ref. [2]). But Guichard and colleagues obtained diffraction patterns from single-crystal domains in graphene rather than from multiple crystalline domains. By recording the atoms’ arrival times, the team was able to distinguish elastic from inelastic scattering—which led to sharper diffraction images than previously observed.
When comparing their data with theoretical models, the researchers found that only the most advanced calculations could fit the observations—simpler models failed to reproduce the effects of the hydrogen–graphene interactions. The researchers say that the need for the advanced models is evidence of the sensitivity of the measurements. Future work in this field could explore how diffraction patterns change when a material is strained or when it contains defects.
–Rajesh K. Malla
Rajesh K. Malla is an Associate Editor of Physical Review Letters.
References
- P. Guichard et al., “Fast hydrogen atom diffraction through monocrystalline graphene,” Phys. Rev. Lett. 135, 263403 (2025).
- C. Kanitz et al., “Diffraction of helium and hydrogen atoms through single-layer graphene,” Science 389, 724 (2025).