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Role of alkali atoms in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>A</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
We show that hopping via alkali atoms plays an important role for the ${t}_{1u}$ band of ${A}_{4}{\mathrm{C}}_{60}$ $(A=\mathrm{K}$, Rb), in strong contrast to ${A}_{3}{\mathrm{C}}_{60}.$ Thus the ${t}_{1u}$ band is broadened by more than $40%$ by the presence of the alkali atoms. The difference between ${A}_{4}{\mathrm{C}}_{60}$ and ${A}_{3}{\mathrm{C}}_{60}$ is in particular …