Accelerated ab-initio Molecular Dynamics: probing the weak dispersive forces in dense liquid hydrogen

Abstract

We propose an ab-initio molecular dynamics method, capable to reduce dramatically the autocorrelation time required for the simulation of classical and quantum particles at finite temperature. The method is based on an efficient implementation of a first order Langevin dynamics modified by means of a suitable, position dependent acceleration matrix $S$. Here we apply this technique, within a Quantum Monte Carlo (QMC) based wavefuntion approach and within the Born-Oppheneimer approximation, for determining the phase diagram of high-pressure Hydrogen with simulations much longer than the autocorrelation time. With the proposed method, we are able to equilibrate in few hundreds steps even close to the liquid-liquid phase transition (LLT). Within our approach we find that the LLT transition is consistent with recent density functionals predicting a much larger transition pressures when the long range dispersive forces are taken into account.

4 pages plus supplementary

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Cited by in corpus (12)

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• Microcanonical and finite temperature ab initio molecular dynamics simulations on quantum computers
• Quantum Monte Carlo tunneling from quantum chemistry to quantum annealing
• Solution of the "sign problem" for the half filled Hubbard-Holstein model
• Deep Variational Free Energy Approach to Dense Hydrogen
• Towards Quantum Monte Carlo Forces on Heavier Ions: Scaling Properties
• Non-adiabatic effects and exciton-like states during insulator-to-metal transition in warm dense hydrogen
• Probing the effects of broken symmetries in machine learning
• Efficient Langevin dynamics for "noisy" forces