72 results found
Mostofi AA, Skylaris CK, Haynes PD, et al., 2002, Total-energy calculations on a real space grid with localized functions and a plane-wave basis, COMPUTER PHYSICS COMMUNICATIONS, Vol: 147, Pages: 788-802, ISSN: 0010-4655
Skylaris CK, Dieguez O, Haynes PD, et al., 2002, Comparison of variational real-space representations of the kinetic energy operator, PHYSICAL REVIEW B, Vol: 66, ISSN: 1098-0121
Skylaris CK, Mostofi AA, Haynes PD, et al., 2002, Nonorthogonal generalized Wannier function pseudopotential plane-wave method, PHYSICAL REVIEW B, Vol: 66, ISSN: 1098-0121
Skylaris CK, Mostofi AA, Haynes PD, et al., 2001, Accurate kinetic energy evaluation in electronic structure calculations with localized functions on real space grids, COMPUTER PHYSICS COMMUNICATIONS, Vol: 140, Pages: 315-322, ISSN: 0010-4655
Gan CK, Haynes PD, Payne MC, 2001, First-principles density-functional calculations using localized spherical-wave basis sets, PHYS REV B, Vol: 63, ISSN: 0163-1829
We present a detailed study of the use of localized spherical-wave basis sets, first introduced in the context of lineal scaling, in first-principles density-functional calculations. Several parameters that control the completeness of this basis set are fully investigated on systems such as molecules and bulk crystalline silicon. We find that the results are in good agreement with those obtained using the extended plane-wave basis set. Since the spherical-wave basis set is accurate, easy to handle, relatively small, and can be systematically improved, we expect it to be of use in other applications.
Cote M, Haynes PD, Molteni C, 2001, Boron nitride polymers: Building blocks for organic electronic devices, PHYS REV B, Vol: 63, Pages: art. no.-125207, ISSN: 1098-0121
Modern electronic devices an increasingly being designed by combining materials with different electronic properties. The conventional semiconductor industry has achieved this by building heterostructures, such as quantum wells and superlattices, from materials with the same crystal structure but different constituent atoms. We propose that boron nitride polymers, with the same structure as organic polymers, will allow the same idea to be applied to polymer materials, already recognized as a cheap alternative to inorganic semiconductors. We demonstrate the similarity between organic polymers and their boron nitride analogues and then explore the potential innovations, including band gap tuning, that these new polymers could bring to organic polymer research.
Gan CK, Haynes PD, Payne MC, 2001, Preconditioned conjugate gradient method for the sparse generalized eigenvalue problem in electronic structure calculations, COMPUTER PHYSICS COMMUNICATIONS, Vol: 134, Pages: 33-40, ISSN: 0010-4655
Haynes PD, Cote M, 2000, Parallel fast Fourier transforms for electronic structure calculations, COMPUTER PHYSICS COMMUNICATIONS, Vol: 130, Pages: 130-136, ISSN: 0010-4655
Haynes PD, Payne MC, 2000, An ab initio linear-scaling scheme, MOLECULAR SIMULATION, Vol: 25, Pages: 257-264
In this paper we briefly survey the current state of ab initio calculations in terms of the accuracy and range of applicability of these methods for studying complex processes in real materials. We highlight some of the successes and limitations of these techniques and discuss the extent to which linear-scaling methods are able to extend the scope and scale of ab initio calculations. We argue that a combination of linear-scaling methods and hybrid modelling schemes is required to overcome many of the difficulties currently faced by conventional schemes, and present our own contributions towards the development of a robust and reliable linear-scaling method.
Haynes PD, Payne MC, 1999, Corrected penalty-functional method for linear-scaling calculations within density-functional theory, PHYS REV B, Vol: 59, Pages: 12173-12176, ISSN: 0163-1829
We present a method for the calculation of ground-state total energies within density-functional theory, based upon the single-particle density-matrix formulation, which requires a computational effort which scales only linearly with system size. The difficult idempotency constraint is imposed approximately using a penalty functional constructed to allow efficient minimization. The resulting error in the total energy due to the violation of idempotency is removed by an analytic correction. The results for a system comprising 216 atoms of crystalline silicon are compared with those from a standard plane-wave code. Linear scaling to 512 atoms is also demonstrated on a workstation. [S0163-1829(99)10519-8].
Haynes PD, Payne MC, 1998, Failure of density-matrix minimization methods for linear-scaling density-functional theory using the Kohn penalty-functional, SOLID STATE COMMUNICATIONS, Vol: 108, Pages: 737-741, ISSN: 0038-1098
Haynes PD, Payne MC, 1997, Localised spherical-wave basis set for O(N) total-energy pseudopotential calculations, COMPUTER PHYSICS COMMUNICATIONS, Vol: 102, Pages: 17-27, ISSN: 0010-4655
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