A split-step method to include electron-electron collisions via Monte Carlo in multiple rate equation simulations

作者：Huthmacher Klaus; Molberg Andreas K; Rethfeld Baerbel; Gulley Jeremy R^*

来源：Journal of Computational Physics, 2016, 322: 535-546.

DOI：10.1016/j.jcp.2016.06.043

• Split-step method
• Operator splitting
• Laser-induced ionization
• Free electron dynamics
• Monte Carlo
• Electron-electron collisions
• C++11
• FORTRAN 2003
• Interface
• OpenMP

A split-step numerical method for calculating ultrafast free-electron dynamics in dielectrics is introduced. The two split steps, independently programmed in C++11 and FORTRAN 2003, are interfaced via the presented open source wrapper. The first step solves a deterministic extended multi-rate equation for the ionization, electron-phonon collisions, and single photon absorption by free-carriers. The second step is stochastic and models electron-electron collisions using Monte-Carlo techniques. This combination of deterministic and stochastic approaches is a unique and efficient method of calculating the nonlinear dynamics of 3D materials exposed to high intensity ultrashort pulses. Results from simulations solving the proposed model demonstrate how electron-electron scattering relaxes the non-equilibrium electron distribution on the femtosecond time scale.

• 出版日期2016-10-1