Defect Chemistry and Spectroscopy
The Defect chemistry and Spectroscopy group's aim is to develop multi-scale simulation techniques for point defects and related topics, and to apply them to problems in functional materials design.
Code development
An important activity is to maintain and extend our in-house DFT library S/PHI/nX. Recent achievements include
- atomic spin constraints
- optimized key routines (FFT-based convolution, reciprocal space projection) to improve performance on modern multi-core, vectorized CPUs
- on-the-fly parameterized internal-coordinate Hessian for quasi-Newton optimization
- Hubbard-U corrections for molecular orbitals
Zoom Image
Perfomance of the supercell correction scheme.
Perfomance of the supercell correction scheme.
© Christoph Freysoldt, Max-Planck-Institut für Eisenforschung GmbH
© Christoph Freysoldt, Max-Planck-Institut für Eisenforschung GmbH
Multi-scale method development
- supercell corrections for charged defects (see sxdefectalign tool)
- supercell corrections for charged defects at surfaces
- electro-elastic model potential, notably for phonon calculations
Intelligent Algorithms
- Redundant-internal coordinate optimization learning force-constants on the fly
- Automatic feature detection in atomically resolved STEM images
Applications
We work in the following application fields:
- GaN-based alloys for high-performance LEDs
- thin film solar cell materials
- oxides & corrosion
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