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arXiv · 2510.04925

The two conduction bands of monolayer CrSBr on Au

Yogal Prasad Ghimirey·Laxman Nagireddy·Cephise Cacho·Neil R. Wilson·Matthew D. Watson
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Abstract

We report the electronic structure of monolayer CrSBr exfoliated onto mica template-stripped gold substrates. Angle-resolved photoemission spectroscopy reveals charge transfer from the substrate, populating the conduction band of monolayer CrSBr, accompanied by a pronounced reduction in the quasiparticle band gap. Furthermore, we observe two separate conduction bands that exhibit a splitting at the X point. This indicates a breaking of glide-mirror symmetry, which in the bulk or in a free-standing monolayer protects the band degeneracies at the Brillouin zone boundary. Our results demonstrate that ultraflat gold substrates do more than modify carrier densities and screening: they can lift symmetry-protected degeneracies and thus fundamentally reshape the band topology of 2D materials.

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Yogal Prasad Ghimirey, Laxman Nagireddy, Cephise Cacho, Neil R. Wilson, Matthew D. Watson. 2025-10-06. The two conduction bands of monolayer CrSBr on Au. https://arxiv.org/abs/2510.04925

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