Lattice constant, DOS, and band structure of Si
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Lattice constant of Si
For bulk materials it is a common task in DFT calculations, given an atomic structure, to find the equilibrium volume of the unit cell. Here we study Silicon which has diamond lattice structure shown in the Figure below:
To determine the equilibrium volume and thereby the lattice constant , a series of calculations is made where is swept over a range around some initial guess (below we start from Failed to parse (SVG with PNG fallback (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle a = 5.43 \text{\AA} } and sweep the lattice parameter �5% in five steps).