Sternheimer equation - TDDFT.org
Sternheimer equation - TDDFT.org
Sternheimer equation - TDDFT.org
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Polarization of a periodic system<br />
Linear response can get derivatives<br />
but not the polarization itself.<br />
Berry phase with “strings” of k-points:<br />
Single-point Berry phase (from just the Γ point)<br />
Yaschenko, Fu, Resca, and Resta, PRB 58, 1222 (1998)
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