About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Algorithm Development in Materials Science and Engineering
|
Presentation Title |
Massive Parallelism for Theoretical Spectroscopy and Femtosecond Electron Dynamics First-principles Simulations |
Author(s) |
Andre Schleife |
On-Site Speaker (Planned) |
Andre Schleife |
Abstract Scope |
Massively parallel supercomputers have become increasingly available for computational materials research. Hence, research codes need to be modernized or planned with this type of hardware in mind. I will discuss two examples in the context of theoretical spectroscopy for excited-electronic properties and femtosecond real-time dynamics: We integrated the modern, parallel ChASE eigensolver into an existing first-principles code for solving the Bethe-Salpeter equation for the optical polarization function, and implemented parallel reading routines. Based on numerical tests we show remarkable speedup and scaling on multi- and many-core architectures. This extends the lifetime of the code and enables studies of previously inaccessible complex materials. The second example focuses on numerical time stepping of a plane-wave expansion of the time-dependent Kohn-Sham equations. After interfacing Qb@ll with the PETSc library, we compare explicit time stepping algorithms regarding numerical error and efficiency. Machine learning is discussed as a possibility to circumvent expensive explicit time stepping. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Electronic Materials, Modeling and Simulation |