Abstract
Quantum Monte Carlo (QMC) methods such as Variational Monte Carlo, Diffusion Monte Carlo or Path Integral Monte Carlo are the most accurate and general methods for computing total electronic energies. We will review methods we have developed to perform QMC for the electrons coupled to another MC simulation for the ions. In this method, one estimates the Born-Oppenheimer energy E(Z) where Z represents the ionic degrees of freedom. That estimate of the energy is used in a Metropolis simulation of the ionic degrees of freedom. Important aspects of this method are how to deal with the noise, which QMC method and which trial function to use, how to deal with generalized boundary conditions on the wave function so as to reduce the finite size effects. We discuss some advantages of the CEIMC method concerning how the quantum effects of the ionic degrees of freedom can be included and how the boundary conditions can be integrated over. Using these methods, we have performed simulations of liquid H2 and metallic H on a parallel computer.
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Ceperley, D., Dewing, M., Pierleoni, C. (2002). The Coupled Electronic-Ionic Monte Carlo Simulation Method. In: Nielaba, P., Mareschal, M., Ciccotti, G. (eds) Bridging Time Scales: Molecular Simulations for the Next Decade. Lecture Notes in Physics, vol 605. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45837-9_17
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DOI: https://doi.org/10.1007/3-540-45837-9_17
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