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Parameter: chgrd

Definition

Number of linear grid points in [-1,1] which is used to define the Chebyshev polynomials.

Type

Integer

Default value

20001

Component

Only for the GARDENIA, NARCISSUS, LAVENDER, CAMELLIA, and MANJUSHAKA components.

Behavior

The second kind Chebyshev orthogonal polynomials are defined in a linear grid in [-1,1]. And the number of grid points is controlled by this parameter.

Comment

This parameter is useful only when isort = 3 or isort = 6 . See isort for more details. The 20001 is an optimal value for chgrd. It is not recommended to modify it.

See also chmax for more details.

As for the applications of orthogonal polynomials in CT-QMC impurity solver, please refer to Lewin's[1] and Hartmann's[2] papers.

Reference

  • 1Lewin Boehnke, Hartmut Hafermann, Michel Ferrero, Frank Lechermann, and Olivier Parcollet, Phys. Rev. B 84, 075145 (2011).
  • 2Hartmut Hafermann, Kelly R. Patton, and Philipp Werner, Phys. Rev. B 85, 205106 (2012).