Parameter: wc

Definition

It is a model parameter for the Hubbard-Holstein model or dynamical screening effect. The exact definition of wc depends on the value of isscr parameter.

Type

Float, double precision

Default value

1.0

Component

Only for the NARCISSUS component.

Behavior

There are five possible choices for the wc parameter so far:

• isscr = 1, no meaning.

• isscr = 2, the $\omega_0$ parameter in the Hubbard-Holstein model.

• isscr = 3, the $\omega'$ parameter in the plasmon-pole model for dynamical screening effect.

• isscr = 4, the $\omega_c$ parameter in the ohmic model for dynamical screening effect.

• isscr = 99, no meaning.

Comment

Only when isscr > 1, it matters. Please see isscr parameter for more details. About CT-QMC algorithms for the Hubbard-Holstein model and dynamical screening effect (including plasmon-pole model and ohmic model), please refer to Philipp Werner's papers^1,2.

Reference

¹ Philipp Werner and Andrew J. Millis, Phys. Rev. Lett 99, 146404 (2007).

² Philipp Werner and Andrew J. Millis, Phys. Rev. Lett. 104, 146401 (2010).