Surface region band enhancement in noble gas adsorption assisted ARPES on kagome superconductor RbV3Sb5
arxiv(2024)
摘要
Electronic states near surface regions can be distinct from bulk states,
which are paramount in understanding various physical phenomena occurring at
surfaces and in applications in semiconductors, energy, and catalysis. Here, we
report an abnormal surface region band enhancement effect in angle-resolved
photoemission spectroscopy on kagome superconductor RbV3Sb5, by depositing
noble gases with fine control. In contrast to conventional surface
contamination, the intensity of surface region Sb band can be enhanced more
than three times with noble gas adsorption. In the meantime, a hole-dope effect
is observed for the enhanced surface region band, with other bands hardly
changing. The doping effect is more pronounced with heavier noble gases. We
propose that noble gas atoms selectively fill into alkali metal vacancy sites
on the surface, which improves the surface condition, boosts surface region
bands, and effectively dopes it with the Pauli repulsion mechanism. Our results
provide a novel and reversible way to improve surface conditions and tune
surface region bands by controlled surface noble gas deposition.
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