The absence of an electron from a silicon atom can be thought of as a hole.

硅原子中缺少一个电子，可以看成是一个空穴。

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The four large spheres represent oxygen atoms, and the dark one represents a silicon atom.

图中四个大的圆球代表氧原子，那个暗色的圆球则代表一个硅原子。

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Others point out that the Atom's "silicon area" is too big.

FORBES: Magazine Article

If the atom in question is in a small particle on the surface of a piece of silicon, the result is what is known as a surface plasmon.

ECONOMIST: Solar energy