Nuclear Quantum Effects and Nonlocal Exchange-Correlation Functionals Applied to Liquid Hydrogen at High Pressure
arXiv:1303.6671 · doi:10.1103/PhysRevLett.110.065702
Abstract
Using first-principles molecular dynamics, we study the influence of nuclear quantum effects (NQEs) and nonlocal exchange--correlation density functionals (DFs) near molecular dissociation in liquid hydrogen. NQEs strongly influence intramolecular properties, such as bond stability, and are thus an essential part of the dissociation process. Moreover, by including DFs that account for either the self-interaction error or dispersion interactions, we find a much better description of molecular dissociation and metallization than previous studies based on classical protons and/or local or semi-local DFs. We obtain excellent agreement with experimentally measured optical properties along pre-compressed Hugoniots, and while we still find a first-order liquid--liquid transition at low temperatures, transition pressures are increased by more than 100 GPa.
References in corpus (6)
- Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
- A Higher-Accuracy van der Waals Density Functional
- Accelerating the convergence of path integral dynamics with a generalized Langevin equation
- The Melting Line of Hydrogen at High Pressures
- Coupled Electron Ion Monte Carlo Calculations of Dense Metallic Hydrogen
- Quantum Monte Carlo Simulation of the High-Pressure Molecular-Atomic Crossover in Fluid Hydrogen