turboTDDFT 2.0 Hybrid functionals and new algorithms within time-dependent density-functional perturbation theory

We present a new release of the turboTDDFT code featuring an implementation of hybrid functionals, a recently introduced pseudo-Hermitian variant of the Liouville-Lanczos approach to time-dependent density-functional perturbation theory, and a newly developed Davidson-like algorithm to compute selected interior eigenvalues/vectors of the Liouvillian super-operator. Our implementation is thoroughly validated against benchmark calculations performed on the cyanin (C21O11H21) molecule using the Gaussian 09 and turboTDDFT 1.0 codes. Program summary Program title: turboTDDFF 2.0 Catalogue identifier: AEIX_v2_0 Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AEDCv2_0.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: GNU General Public License, version 2 No. of lines in distributed program, including test data, etc.: 5995995 No. of bytes in distributed program, including test data, etc.: 122184812 Distribution format: tar.gz Programming language: Fortran 95, MAI. Computer: Any computer architecture. Operating system: GNU/Linux, AIX, IRIX, Mac OS X, and other UNIX-like OS's. Classification: 16.2, 16.6, 7.7. External routines: turboTDDFT 2.0 is a tightly integrated component of the Quantum ESPRESSO distribution and requires the standard libraries linked by it: BIAS, LAPACK, FFTW, MPI. Does the new version supercede the previous version?: Yes Nature of problem: Calculation of the optical absorption spectra of molecular systems. Solution method: Electronic excited states are addressed by linearized time-dependent density-functional theory within the plane-wave pseudo-potential method. The dynamical polarizability can be computed in terms of the resolvent of the Liouvillian super-operator, using a pseudo-Hermitian variant of the Lanczos recursion scheme. As an alternative, individual eigenvalues of the Liouvillian can be computed via a newly introduced variant of the Davidson method. In both cases, hybrid functionals can now be used. Reasons for new version: To implement new features. Summary of revisions: New features implemented: 1. Hybrid functionals. 2. Pseudo-Hermitian Lanczos recursion algorithm. 3. All-new Davidson-like solver for the Liouvillian eigenvalue equation ("Casida equation"). Restrictions: Spin-restricted formalism. Linear-response regime. Adiabatic XC kernels only. Hybrid functionals are only accessible using norm-conserving pseudo-potentials. Unusual features: No virtual orbitals are used, nor even calculated. Within the Lanczos method a single recursion gives access to the whole optical spectrum; when computing individual excitations using the Davidson method, interior eigenvalues can be easily targeted. Additional comments: !!!!! The distribution file for this program is over 121 Mbytes and therefore is not delivered directly when download or E-mail is requested. Instead a html file giving details of how the program can be obtained is sent. Running time: From a few minutes for small molecules on serial machines up to many hours on multiple processors for complex nanosystems with hundreds of atoms. (C) 2014 Elsevier B.V. All rights reserved.

Published in:
Computer Physics Communications, 185, 7, 2080-2089
Amsterdam, Elsevier Science Bv

 Record created 2014-08-29, last modified 2018-03-17

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