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Nearly-free-electron system of monolayer Na on the surface of single-crystal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>HfSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
The electronic structure of a single Na monolayer on the surface of single-crystal ${\mathrm{HfSe}}_{2}$ is investigated using angle-resolved photoemission spectroscopy. We find that this system exhibits an almost perfect ``nearly-free-electron'' behavior with an extracted effective mass of $\ensuremath{\sim}1{m}_{e}$, in contrast to heavier masses found previously for alkali-metal monolayers on other …