Optical absorption measurements of electron quantum confinement in Si(111)-2 × 1 surface chains
2010
Optical experiments on the Si(111)-2x1 surface show that the absorption peak due to dangling-bond
transitions exhibits a blueshift upon oxygen exposure. The effect is interpreted as due to quantum confinement
of surface electrons in pi-bonded chains of atoms, whose length decreases with oxygen uptake (a particle in a box effect, the box being one dimensional). This conclusion is supported by numerical simulation of the
optical spectra.
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