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Siesta I - Psi-k

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Solving H (diagonalising)<br />

Nearsightedness principle<br />

Implies localisation:<br />

W. Kohn, Phys. Rev. Lett. 76, 3168 (1996)<br />

"( r r , r # r )<br />

"( r r # r<br />

R )<br />

' '' % 0<br />

r $ r #%&<br />

& && $ 0<br />

r # R r<br />

$%<br />

Wannier-like unitary transformations of eigenvectors:<br />

!<br />

localised basis of occupied space<br />

!

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