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Title: Stable Solid Molecular Hydrogen above 900 K from a Machine-Learned Potential Trained with Diffusion Quantum Monte Carlo

Journal Article · · Physical Review Letters

Here, we survey the phase diagram of high-pressure molecular hydrogen with path integral molecular dynamics using a machine-learned interatomic potential trained with quantum Monte Carlo forces and energies. Besides the HCP and C2/c–24 phases, we find two new stable phases both with molecular centers in the Fmmm–4 structure, separated by a molecular orientation transition with temperature. The high temperature isotropic Fmmm–4 phase has a reentrant melting line with a maximum at higher temperature (1450 K at 150 GPa) than previously estimated and crosses the liquid-liquid transition line around 1200 K and 200 GPa.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; NSF of China
Grant/Contract Number:
SC0020177; 12172112; 11932005; AC05-00OR22725
OSTI ID:
1958013
Journal Information:
Physical Review Letters, Vol. 130, Issue 7; Related Information: Y. Yang, S. Jensen, D. M. Ceperley, K. Kowalik,and M. Turk, yt hub qmc data browser, https://qmc-hamm.hub.yt/data.html (2022); ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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