Optical absorption measurements of electron quantum confinement in Si(111)2x1 surface chains

摘要

Optical experiments on the Si(111)-2x1 surface show that the absorption peak due to dangling-bondudtransitions exhibits a blueshift upon oxygen exposure. The effect is interpreted as due to quantum confinementudof 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 theudoptical spectra.