Official Resources
- Homepage (Legacy): http://www.dl.ac.uk/TCSC/Software/PLATO/
- Research Group: https://www.imperial.ac.uk/materials/research/tsm/ (Theory and Simulation of Materials, Imperial College London)
- References: S. D. Kenny, A. P. Horsfield, H. Fujitani, Phys. Rev. B 62, 4899 (2000).
- License: Academic/Research (typically distributed via CCP9 or request)
Overview
PLATO is a localized orbital-based electronic structure package developed by Andrew Horsfield, Steve Kenny, and collaborators (Imperial College London, UCL, Loughborough). It allows for both tight-binding and density functional theory (DFT) calculations within a single framework. PLATO is particularly noted for its efficiency in handling large systems using O(N) methods and its versatility in treating both orthogonal and non-orthogonal basis sets.
Scientific domain: Tight-binding, DFT, localized orbitals, O(N) methods
Target user community: Materials scientists, tight-binding researchers, large-scale simulation community
Theoretical Methods
- Density Functional Theory (DFT)
- Tight-Binding (TB)
- Numerical Atomic Orbitals (NAO)
- Linear Combination of Atomic Orbitals (LCAO)
- Non-orthogonal and orthogonal basis sets
- Multipole expansions for electrostatics
- O(N) scaling algorithms
Capabilities
- Ground-state electronic structure
- Structural relaxation
- Molecular dynamics
- Tight-binding parametrization
- DFT calculations with localized bases
- Large system simulations (thousands of atoms)
- Transport properties (with additional modules)
- Point defects and extended defects
Key Strengths
Unified Framework
- Seamlessly bridges Tight-Binding and DFT
- Allows testing of TB parameters against DFT within the same code
Efficiency
- Optimized for O(N) scaling
- Efficient handling of large supercells
- Suitable for complex defect structures
Inputs & Outputs
- Input formats:
input.dat (Control parameters)- Structure files
- Basis set definitions
- Output data types:
- Energy, forces, stress
- Charge densities
- Band structures (using auxiliary tools)
Limitations
- Availability: Not a standard open-source repository; often obtained via academic channels (CCP9).
- Documentation: Less publicly accessible than major community codes like VASP or QE.
Computational Cost
- O(N) Scaling: Linear scaling with system size, enabling calculations on thousands of atoms.
- Efficiency: Very high for tight-binding; DFT mode slower but competitive for large systems.
Comparison with Other Codes
- vs SIESTA: Both are O(N) codes using localized orbitals. PLATO allows direct comparison of TB and DFT parameters.
- vs VASP: PLATO is specialized for large systems/O(N); VASP is a general purpose plane-wave code (scaling $N^3$).
Best Practices
- Basis Set: Careful testing of basis set completeness is required (unlike plane waves).
- Parameters: TB parameters must be transferable to your system of interest.
Community and Support
- Access: Distributed via CCP9 (Collaborative Computational Project 9) or by request.
- Support: Direct academic collaboration with developers.
Verification & Sources
- Primary Source: Published literature (Phys. Rev. B 62, 4899) and Imperial College research pages.
- Confidence: VERIFIED - Well-established code in the tight-binding/DFT community.