Optical Second Harmonic Generation in Semiconductor Nanostructures

<table>Atomic structure of Si(001)<svg height="15.0875" id="M77" style="vertical-align:-2.3205pt" version="1.1" viewbox="0 0 45.737499 15.0875" width="45.737499" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,12.138)"><use xlink:href="#x28"></use></g><g transform="matrix(.017,-0,0,-.017,5.944,12.138)"><use xlink:href="#x32"></use></g><g transform="matrix(.017,-0,0,-.017,17.877,12.138)"><use xlink:href="#xD7"></use></g><g transform="matrix(.017,-0,0,-.017,31.629,12.138)"><use xlink:href="#x32"></use></g><g transform="matrix(.017,-0,0,-.017,39.789,12.138)"><use xlink:href="#x29"></use></g>
</svg> surface with one local dimer oxygen configuration per unit cell (a) and atomic structure of Si(001)<svg height="15.0875" id="M78" style="vertical-align:-2.3205pt" version="1.1" viewbox="0 0 45.737499 15.0875" width="45.737499" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,12.138)"><use xlink:href="#x28"></use></g><g transform="matrix(.017,-0,0,-.017,5.944,12.138)"><use xlink:href="#x32"></use></g><g transform="matrix(.017,-0,0,-.017,17.877,12.138)"><use xlink:href="#xD7"></use></g><g transform="matrix(.017,-0,0,-.017,31.629,12.138)"><use xlink:href="#x31"></use></g><g transform="matrix(.017,-0,0,-.017,39.789,12.138)"><use xlink:href="#x29"></use></g>
</svg> surface with an oxygen atom located on a broken back bond. (b) Red and white colored balls correspond to oxygen and hydrogen atoms, respectively (adapted from [<a href="/journals/physri/2012/836430/#B25">25</a>]).</table>

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Optical Second Harmonic Generation in Semiconductor Nanostructures

Figure 7