ENCUTGWSOFT

ENCUTGWSOFT = [real] (energy cutoff for response function) 

Default: ENCUTGWSOFT	= ENCUTGW[math]\displaystyle{ \times 0.8 }[/math]	for ALGO=ACFDT
	= ENCUTGW	else

Descprition: The flag allows to truncate the Coulomb kernel slowly between the energy specified by ENCUTGWSOFT and ENCUTGW.

---

This usually leads to much smoother energy-volume curves in ACFDT calculations and MP2 calculations. The modified Coulomb kernel is in this case: [math]\displaystyle{ v_{\bold{G}} = \frac{4 \pi e^2} {| \bold{G}|^2} \frac{1}{2} \left( 1 + \cos \left( \pi \, \frac{ \frac{\hbar^{2} |\bold{G}|^2 }{2 m_e} - \mathbf{ ENCUTGWSOFT} }{ \mathbf{ENCUTGW} - \mathbf{ENCUTGWSOFT}} \right) \right) \qquad \mbox{for} \quad \frac{\hbar^2 |\bold{G}|^2 }{2 m_e} \gt \mathbf{ENCUTGWSOFT} }[/math]

Related Tags and Sections

PRECFOCK, ENCUT, ENCUTGW, GW calculations

Examples that use this tag

---

Contents