Nonlocal Coulomb interactions play a crucial role in stabilizing distinct electronic phases in kagome materials. In this work, we systematically investigate the effects of on-site ($U$) and intersite ($V$) Coulomb interactions on the electronic structure and stability of charge-density-wave (CDW) phases in the kagome metal ${\mathrm{KV}}_3{\mathrm{Sb}}_5$ using density functional theory ($\text{DFT}+U+V$) calculations. We demonstrate that $V$ promotes the formation and stability of CDW phases, whereas $U$ suppresses these phases, highlighting a fundamental competition between local and nonlocal Coulomb interactions. By directly comparing our theoretical results with angle-resolved photoemission spectroscopy (ARPES) data, we identify realistic values of $U$ and $V$ that accurately describe the electronic band structure of ${\mathrm{KV}}_3{\mathrm{Sb}}_5$. Our findings establish a detailed $U\text{−}V$ phase diagram for ${\mathrm{KV}}_3{\mathrm{Sb}}_5$, offering valuable insights into the correlated electronic states in kagome metals and serving as a foundation for future explorations of correlation-driven phenomena in related materials.

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• Charge density waves
• Electronic structure
• Kagome metal
• DFT+U
• Density functional calculations